Cordless telephone system

ABSTRACT

A cordless telephone system including at least a first cordless base and a first handset, wherein either or both of the cordless base or the handset further contain a wireless receiver for receiving signals from at least one wireless sensor. The wireless sensor sends its wireless communications in a different frequency band than is used by the cordless telephone system. This cordless telephone system is typically based upon the same architecture and same components as a security system or security network described in cross referenced applications, but the product packaging appears in an embodiment that is more familiar to users as a cordless telephone system. The wireless sensors can be in several example forms such as intrusion sensors, which are used for example in perimeter monitoring or motion sensing, fire or smoke sensors, glass breakage sensors, or temperature sensors.

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This patent application is a continuation-in-part of U.S.application Ser. No. 10/795,368, Multi-controller Security Network,attorney document number RFID-0108, filed Mar. 9, 2004 by the inventorof the present application, which is itself a continuation-in-part ofU.S. application Ser. No. 10/602,854, RFID Reader for a SecurityNetwork, attorney document number RFID-0107, filed Jun. 25, 2003, whichis itself a continuation-in-part of U.S. application Ser. No.10/423,887, RFID Based Security Network, attorney document numberRFID-0106, filed Apr. 28, 2003. This patent application is further crossreferenced to the following patent applications: Configuration Programfor a Security System, attorney document number RFID-0110, mailed Apr.8, 2004; Communications Architecture for a Security Network, attorneydocument number RFID-0109 (U.S. application Ser. No. 10/806,371 filedMar. 23, 2004); RFID Based Security System, attorney document numberRFID-0100 (U.S. application Ser. No. 10/356,512 filed on Feb. 3, 2003)and to the following patent applications, all filed Feb. 14, 2003:

[0002] Communications Control in a Security System, RFID-0101 (Ser. No.10/366,320);

[0003] Device Enrollment in a Security System, RFID-0102 (Ser. No.10/366,335);

[0004] Controller for a Security System, RFID-0103 (Ser. No.10/366,334);

[0005] RFID Transponder for a Security System, RFID-0104 (Ser. No.10/366,317);

[0006] RFID Reader for a Security System, RFID-0105 (Ser. No.10/366,316).

[0007] All of the foregoing cross referenced patent applications areincorporated by reference into this present patent application.

BACKGROUND OF THE INVENTION

[0008] Security systems and home automation networks are described innumerous patents, and have been in prevalent use for over 40 years. Inthe United States, there are over 14 million security systems inresidential homes alone. The vast majority of these systems arehardwired systems, meaning the keypad, system controller, and variousintrusion sensors are wired to each other. These systems are easy toinstall when a home is first being constructed and access to theinteriors of walls is easy; however the cost increases substantiallywhen wires must be added to an existing home. On average, the securityindustry charges approximately $75 per opening (i.e. window or door) toinstall a wired intrusion sensor (such as a magnet and reed switch),where most of this cost is due to the labor of drilling holes andrunning wires to each opening. For this reason, most homeowners onlymonitor a small portion of their openings. This is paradoxical becausemost homeowners actually want security systems to cover their entirehome.

[0009] In order to induce a homeowner to install a security system, manysecurity companies will underwrite a portion of the costs of installinga security system. Therefore, if the cost of installation were $1,500,the security company may only charge $500 and then require the homeownerto sign a multi-year contract with monthly fees. The security companythen recovers its investment over time. Interestingly enough, if ahomeowner wants to purchase a more complete security system, the revenueto the security company and the actual cost of installation generallyrise in lockstep, keeping the approximate $1,000 investment constant.This actually leads to a disincentive for security companies to installmore complete systems—it uses up more technician time without generatinga higher monthly contract or more upfront profit. Furthermore, spendingmore time installing a more complete system for one customer reduces thetotal number of systems that any given technician can install per year,thereby reducing the number of monitoring contracts that the securitycompany obtains per year.

[0010] In order to reduce the labor costs of installing wired systemsinto existing homes, wireless security systems have been developed inthe last 10 to 20 years. These systems use RF communications for atleast a portion of the keypads and intrusion sensors. Typically, atransceiver is installed in a central location in the home. Then, eachopening is outfitted with an intrusion sensor connected to a smallbattery powered transmitter. The initial cost of the wireless system canrange from $25 to $50 for each transmitter, plus the cost of thecentrally located transceiver. This may seem less that the cost of awired system, but in fact the opposite is true over a longer timehorizon. Wireless security systems have demonstrated lower reliabilitythan wired systems, leading to higher service and maintenance costs. Forexample, each transmitter contains a battery that drains over time(perhaps only a year or two), requiring a service call to replace thebattery. Further, in larger houses, some of the windows and doors may bean extended distance from the centrally located transceiver, causing thewireless communications to intermittently fade out. In fact, the ULstandard for wireless security systems allows wireless messages to bemissed for up to 12 hours below considering the missed messages to be aproblem. This implies an allowable error rate of 91%, assuming a onceper hour supervisory rate.

[0011] These types of wireless security systems generally operate under47 CFR 15.231(a), which places limits on the amount of power that can betransmitted. For example, at 433 MHz, used by the wireless transmittersof one manufacturer, an average field strength of only 11 mV/m ispermitted at 3 meters (equivalent to approximately 36 microwatts). At345 MHz, used by the wireless transmitters of another manufacturer, anaverage field strength of only 7.3 mV/m is permitted at 3 meters(equivalent to approximately 16 microwatts). Control or supervisorytransmissions are only permitted once per hour, with a duration not toexceed one second. If these same transmitters wish to transmit dataunder 47 CFR 15.231(e), the average field strengths at 345 and 433 MHzare reduced to 2.9 and 4.4 mV/m, respectively. The current challenges ofusing these methods of transmission are discussed in various patents,including U.S. Pat. Nos. 6,087,933, 6,137,402, 6,229,997, 6,288,639, and6,294,992.

[0012] In either wired or wireless prior art security systems,additional sensors such as glass breakage sensors or motion sensors arean additional cost beyond a system with only intrusion sensors. Eachglass breakage or motion sensor can cost $30 to $50 or more, notcounting the labor cost of running wires from the alarm panel to thesesensors. In the case of wireless security systems, the glass breakage ormotion sensor can also be wireless, but then these said sensors sufferfrom the same drawback as the transmitters using for intrusionsensing—they are battery powered and therefore require periodicservicing to replace the batteries and possible reprogramming in theevent of memory loss.

[0013] Because existing wireless security systems are not reliable andwired security systems are difficult to install, many homeowners foregoself-installation of security systems and either call professionals ordo without. It is interesting to note that, based upon the rapid growthof home improvement chains such as Home Depot and Lowe's, there is alarge market of do-it-yourself homeowners that will attempt carpentry,plumbing, and tile—but not security. There is, therefore, an establishedneed for a security system that is both reliable and capable of beinginstalled by the average homeowner.

[0014] Regardless of whether a present wired or wireless security systemhas been installed by a security company or self-installed, almost allpresent security systems are capable of only monitoring the house forintrusion, fire, or smoke. These investments are technology limited to asubstantially single purpose. There would be a significant advantage tothe homeowner if the security system were also capable of supportingadditional home automation and lifestyle enhancing functions. There is,therefore, an apparent need for a security system that is actually anetwork of devices serving many functions in the home. It is thereforean object of the present invention to provide security system for use inresidential and commercial buildings that can be self-installed orinstalled by professionals at much lower cost than present systems.

BRIEF SUMMARY OF THE INVENTION

[0015] The present invention is a highly reliable system and method forconstructing a security network, or security system, for a buildingcomprising a network of devices and using a novel approach to designingbase units and transponders to provide the radio link between each of anumber of openings and a controller function capable of causing an alertin the event of an intrusion. Some forms of the present invention mayalso provide cordless telephone functionality and may further bepackaged in an embodiment familiar to many end users as a cordlesstelephone system.

[0016] The present invention improves upon the traditional system modeland paradigm by providing a security network with reliability exceedingthat of existing wireless security systems, at lower cost than eitherprofessionally installed hardwired systems or wireless security systems.The present invention also allows self-installation, includingincremental expansion, by typical homeowners targeted by the major homeimprovement and electronics retail chains.

[0017] Several new marketing opportunities are created for a securitynetwork that are otherwise unavailable in the market today. First, forprofessional systems sold by major alarm companies, a single customerservice representative may sell the network to a homeowner and theninstall the network in a single visit to the customer's home. This is incontrast to the present model where a salesperson sells the system andthen an installer must return at a later date to drill holes, pullwires, and otherwise install the system. Second, there is a productupgrade available for existing systems whereby the scope of securitycoverage can be increased by adding base units and transponders to anexisting control panel. Third, homeowners may purchase the inventivesystem at a home improvement chain, self-install the system, andcontract for alarm monitoring from an alarm services company. Theoverall system cost is lower, and the alarm services company is notrequired to underwrite initial installation costs, as is presently donetoday. Therefore, the alarm services company can offer monitoringservices at substantially lower prices. Fourth, a new market forapartment dwellers opens up. Presently, very few security systems areinstalled in apartments because building owners are unwilling to permitthe drilling of holes and installation of permanent systems. Apartmentdwellers are also more transient than homeowners and therefore mostapartment dwellers and alarm service companies are unwilling tounderwrite the cost of these systems anyway. The inventive system is notpermanent, nor is drilling holes for hardwiring required. Therefore, anapartment dweller can purchase the inventive security network, use it inone apartment, and then unplug and move the network to another apartmentlater.

[0018] The improvements provided by the present invention areaccomplished through the following innovations. The first innovation isthe design of a low cost base unit that can cover an area of a house.Rather than rely on the single centrally located transceiver approach ofexisting unreliable wireless security systems, the present inventionallows the placement of multiple base units into multiple rooms andareas for which coverage is desired. The presence of multiple base unitswithin a building provides spatial receiver diversity.

[0019] The second innovation is the use of different types oftransponders to transmit data from covered openings and sensors. Onetransponder may use backscatter modulation. Another transponder may uselow power RF communications (i.e. an active transmitter).

[0020] The third innovation is the permitted use of multiple distributedcontroller functions in the security network. In the present invention,the controller function can be located within any physical embodiment ofa base unit. Therefore, a homeowner or building owner installingmultiple base units will also simultaneously be installing multiplecontroller functions. The controller functions operate in a redundantmode with each other. Therefore, if an intruder discovers and disables asingle base unit containing a controller function, the intruder maystill be detected by the any of the remaining installed base unitscontaining controller functions.

[0021] The fourth innovation is the optional inclusion of a glassbreakage or motion sensor into the base unit. In many applications, abase unit will be likely be installed into multiple rooms of a house.Rather than require a separate glass breakage or motion sensor as inprior art security systems, a form of the base unit includes a glassbreakage or motion sensor within the same integrated package, providinga further reduction in overall system cost when compared to prior artsystems.

[0022] The fifth innovation is the permitted optional use of thetraditional public switched telephone network (i.e. PSTN—the standardhome phone line), the integrated use of a commercial radio mobileservice (CMRS) such as a TDMA, GSM, or CDMA wireless network, or the useof a broadband internet network via Ethernet or WiFi connection forcausing an alert at an emergency response agency such as an alarmservice company. In particular, the use of a CMRS network provides ahigher level of security, and a further ease of installation. The higherlevel of security results from (i) reduced susceptibility of thesecurity system to cuts in the wires of a PSTN connection, and (ii)optional use of messaging between the security system and an emergencyresponse agency such that any break in the messaging will in itselfcause an alert.

[0023] Additional objects and advantages of this invention will beapparent from the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

[0024]FIG. 1 shows a base unit communicating with transponders.

[0025]FIG. 2 shows an example security network formed with multiple baseunits and transponders.

[0026]FIG. 3 shows the architecture of the base unit.

[0027]FIG. 4 shows an example security network formed with multiple baseunits and transponders. Various example physical embodiments of baseunits are shown.

[0028]FIG. 5 shows a generalized network architecture of the securitynetwork. Various example forms of base units are shown, where some baseunits have included optional functionality.

[0029]FIG. 6 shows the distributed manner in which the present inventioncould be installed into an example house.

[0030]FIG. 7 shows the multiple ways in which a gateway can beconfigured to reach different private and external networks.

[0031]FIG. 8 shows some of the multiple ways in which a gateway can beconfigured to reach emergency response agencies and other terminals.

[0032]FIG. 9 shows the control functions in multiple base unitslogically connecting to each other. One control function has beendesignated the master controller.

[0033]FIG. 10 shows an example layout of a house with multiple baseunits, and the manner in which the base units may form a network to usewireless communications to reach a gateway.

[0034]FIG. 11 shows an example architecture of a passive transponder.

[0035]FIG. 12 is a flow chart for a method of providing a remotemonitoring function.

[0036]FIG. 13 shows an example embodiment of a wall mounted base unit inapproximate proportion to a standard power outlet.

[0037]FIGS. 14A and 14B show alternate forms of a passive infraredsensor that may be used with the security system.

[0038]FIG. 15 shows example embodiments of a smoke detector and a smokedetector collar into which an optional base unit or an optionaltransponder has been integrated.

[0039]FIG. 16 shows some of the multiple networks in which gateway canbe configured to reach a remote processor or server which then connectsto one or more emergency response agencies.

[0040]FIG. 17 shows security networks in two neighboring residences inwhich the two security networks cooperate with each other to providealternate means to reach the PSTN, and in which each security networkmay provide alternate communications paths for the base units andtransponders of the other security network.

[0041]FIG. 18 shows multiple gateways connecting to a telephone line anda gateway and telephone disconnect devices controlling access fromtelephony devices to the telephone line.

[0042]FIG. 19 shows the multiple communications paths that may existduring the configuration of the security network or a security system.

[0043]FIG. 20 shows multiple gateways connecting to a telephone line andvarious example base units communicating in a security network.

[0044]FIG. 21 shows a typical statistical relationship between thenumber of base units in a security network and the probability of anyone message being lost (i.e. not received). The exact shape of the curveand values on the axes is dependent upon a specific installation in aspecific building.

[0045]FIGS. 22A and 22B show the locations on the base unit where patchor microstrip antennas may be mounted so as to provide directivity tothe transmissions.

[0046]FIG. 23A shows an example security network where various devicesare communicating with each other.

[0047]FIG. 23B shows an example physical embodiment of a base unitintegrated with an outlet.

[0048]FIG. 23C shows an example security network in which messagesbetween the end point devices can be passed through intermediatedevices.

[0049]FIGS. 24A and 24B show one means by which a base unit may bemounted to a plate, and then mounted to an outlet.

[0050]FIGS. 25A and 25B show examples of LED generators and LEDdetectors that may be used as intrusion sensors.

[0051]FIG. 26 shows an example physical embodiments of a cigarettelighter adaptor for typical use in a vehicle, a remote sounder, andtelephone disconnect devices.

DETAILED DESCRIPTION OF THE INVENTION

[0052] The present invention is a highly reliable system and method forconstructing a security network 400, or security system, for use in abuilding, such as a commercial building, single or multifamilyresidence, or apartment. For consistency with the cross referencedapplications, the term security system may be used sometimes, though inthe context of this present application, the terms security system andsecurity network 400 shall be considered interchangeable as they applyto the present invention. The security network 400 may also be used forbuildings that are smaller structures such as sheds, boathouses, otherstorage facilities, and the like. Throughout this specification, aresidential house will be used as an example when describing aspects ofthe present invention. However, the present invention is equallyapplicable to other types of buildings. Some forms of the presentinvention may also provide cordless telephone functionality and mayfurther be packaged in an embodiment familiar to many end users as acordless telephone system.

[0053] The security network 400 described herein is a set of distributedcomponents that together operate to form a system for detectingintrusion and providing other services to a home or building owner. Thecomponents are arranged in a two-level architecture, described withinthis specification as base units 200 and transponders 100. An examplesecurity network 400 can be formed with as few as one base unit 200 andone transponder 100, however the security network 400 can also grow toinclude large numbers of both types of devices.

[0054] Base units 200 are distinguished by their support for high powerRF communications, meaning that these devices are capable of generatingcontinuous and/or frequent wireless transmissions, typically at powerlevels of 10 or more milliwatts, and typically operating under FCC rules47 CFR 15.247 or equivalent. Base units 200 are capable of self-forminga network and communicating with each other over large distances, suchas kilometer or more depending upon exact implementation. Base units 200will generally be AC powered and/or have rechargeable batteries,although this is not a requirement.

[0055] Transponders 100 are distinguished by their more limitedcommunications capability. Transponders 100 support low power RFcommunications and/or backscatter modulation. Low power RFcommunications means that these devices are only permitted to transmitintermittent wireless communications, typically at average power levelsof less than 10 milliwatts, and typically operating under FCC rules 47CFR 15.231 or 47 CFR 15.249. Transponders 100 are smaller and lessexpensive than base units 200 and do not have access to AC power foreither operation or battery recharging. This lack of access to AC poweris one reason for limiting the communications capability and transmitpower level.

[0056] A transponder 100 supporting only backscatter modulation maysometimes be termed a passive transponder 150. Passive transponders 150cannot independently generate wireless transmissions and can onlyrespond to communications from a base unit 200 using backscattermodulation. Passive transponders 150 based only upon backscattermodulation are less expensive, as they do not contain the circuitry toindependently generate wireless communications. Passive transponders 150are either battery powered or obtain their power from the RFtransmissions of base units 200. Even with a battery, passivetransponders 150 can have a life of ten or more years as their currentdrain from the battery is extremely low. Because passive transponders150 cannot independently generate wireless transmissions, they are notexplicitly governed by any FCC rules and do not require an equipmentauthorization.

[0057] A security network 400 of the present invention may typicallyinclude 4 elements: an intrusion sensor 600, a transponder 100, a baseunit 200, and a controller function 250. FIG. 1 shows this exampleconfiguration of the security network 400 with a single base unit 200communicating with several transponders 100, one of which has anassociated intrusion sensor 600, one of which has any one of severalother sensors 620, and a third which has no sensor. The controllerfunction 250 is logic implemented in firmware or software and runningwithin one or more base units; it is not shown in the diagram, but inthis basic configuration the controller function 250 is contained withinthe base unit 200.

[0058] The security network 400 can be expanded to support multiple baseunits 200. In addition, the security network 400 can communicate withexternal networks 410 using a base unit 200 containing atelecommunications interface as shown in FIG. 23A. FIG. 23C shows themeans by which multiple base units 200 communicate with each other inthe security network 400 by self-forming a network using high power RFcommunications. In FIG. 23C some of the base units 200 can directlycommunicate with each other and some pairs of base units 200 can onlycommunicate through one or more intermediate base units. FIG. 6 shows anexample of how the logical architecture of FIG. 23C might appear in anexample residence.

[0059] The security network 400 of the present invention differssignificantly from existing products in its highly distributedarchitecture and two-way communications. Instead of being centeredaround a single control panel, this invention includes a controllerfunction 250 that can be distributed within and among multiple baseunits 200. Instead of just unidirectional wireless transmitters onwindows 702 and doors 701, this invention can support bidirectionalwireless communications between a transponder 100 and base unit 200.

[0060] Base units 200, once installed, form a security network 400 witheach other as shown in FIGS. 2 and 4. All of the base units 200 in thesecurity network 400 can become aware of and communicate with eachother. As used within the present invention, the term base unit 200shall apply to a family of devices as shown in FIG. 4. There are twodimensions to consider for base units 200: the physical embodiment andthe functional components. Base units 200 can take any one of thefollowing example physical embodiments, among others:

[0061] Wall Unit 262

[0062] Tabletop Unit 261, such as that used as a cordless telephone base(i.e fixed part)

[0063] Ceiling Unit 590 or 591

[0064] Handheld Unit 260, such as that used as a cordless telephonehandset (i.e. portable part)

[0065] Examples of the physical form factors are shown in FIGS. 4 and13. These example form factors are not intended to be limited and otherphysical form factors are also possible. A wall unit 262 will typicallyplug into and be mounted onto an outlet 720. This allows the wall unit262 to be placed anywhere within a room, including unobtrusively behindfurniture. A tabletop unit 261 will typically be of a form factor andaesthetic design that allows the unit to sit on a counter or table topand obtain power from a transformer 267 plugged into a nearby outlet,similar to the base of a cordless telephone system. A ceiling unit 590or 591 will typically be in the form factor of a smoke detector 590 orsmoke detector collar 591, and obtain power from the AC powerconnections to the smoke detector. A handheld unit 260 will typically bein the form factor of a handheld cordless telephone with a rechargeablebattery.

[0066] As shown in FIG. 3, base units 200 can include any of thefollowing example functional components:

[0067] Transceiver for high power RF communications 204

[0068] Receiver or transceiver for low power RF communications 205

[0069] Processor 203

[0070] Memory (volatile and/or non-volatile) 211

[0071] Power supply (AC, rechargeable or non-rechargeable battery) 207and 208

[0072] Antenna system (antenna and interface circuits) 206

[0073] Controller function software 250

[0074] Cordless phone software 240

[0075] Telecommunications interface 220 (example types are shown)

[0076] Other functions 221 (example types following)

[0077] Keypad interface 265

[0078] Display 266

[0079] Acoustic transducer 210

[0080] Camera 213

[0081] Smoke/fire detector interface 212

[0082] Every base unit 200 requires a transceiver for high power RFcommunications 204, a processor 203, memory 211, at least one form ofpower supply 207, and an antenna system 206. Every base unit 200 iscapable of forming a network with other base units 200.

[0083] Any base unit 200 may further include the controller function 250software. Some base units 200 may not include a controller function 250;this may be because that particular base unit 200 is of a form factor orat a physical location for which it would not be desirable for that baseunit 200 to contain controller function 250 software. Within any onesecurity network 400, and at any one particular time, there willgenerally be only one base unit 200 whose controller function has beenassigned to be the master controller for that security network 400. Allother controller functions 250 within other base units 200 willgenerally be slaved to the master controller 251. The base unit 200whose controller function 250 is presently the master controller 251 maysometimes be termed the master controller 251.

[0084] A base unit 200 that includes a telecom interface 220 maysometimes be termed a gateway 300. The gateway 300 may use any ofseveral example means for its telecom interface 220, including a modem210 for connection to a PSTN 403, an Ethernet or WiFi or USB interface313 for connection to a private or public computer network such as theinternet 405, or a CDMA or GSM or TDMA 311 or two-way paging interface312 for connection to a radio network such as a CMRS 402. Forconvenience, the term gateway 300 may be preceded by an identifierdescribing the type of telecom interface within the gateway 300.Therefore, a WiFi gateway 520 refers to a gateway 300 containing a WiFitelecom interface 313. It is important to note that the term gateway 300refers to the functional capability of a base unit 200 that includes atelecom interface 220; the term does not necessarily refer to anyparticular physical embodiment. For example, both a wall unit 262 and atabletop unit 261 may functionally operate as a gateway 300.

[0085]FIG. 5 shows various examples of base units 200 with various addedfunctional components that can be contained and communicate within asecurity network 400. As can be further seen in FIG. 5, differentexample gateways 300 show how the security network 400 can alsocommunicate to networks and systems external to the security network400.

[0086] A keypad 265 may be added to a base unit 200 to provide onemethod for user interface. A gateway 300 can be provided to enablecommunications between the security network 400 and external networks410 such as, for example, a security monitoring company 460. The gateway300 may also convert protocols between the security network 400 and aWiFi network 401 or a USB port of a computer 450. A siren driver 551 maybe added to a base unit 200 provide loud noise-making capability. Anemail terminal 530 can be added to a base unit 200 initiate and receivemessages to/from external networks 410 and via a gateway 300. Othersensors 620 may be added to detect fire, smoke, heat, water,temperature, vibration, motion, as well as other measurable events oritems. A camera and/or audio terminal 540 may be added to a base unit200 to enable remote monitoring via a gateway 300. A keyfob 561 may beadded to enable wireless function control of the security network 400.This list of devices that can be added is not intended to be exhaustive,and other types can also be created and added as well.

[0087] The distributed nature of the security network 400 is shown inthe example layout in FIG. 6 for a small house. At each opening in thehouse, such as windows 702 and doors 701, for which monitoring isdesired, an intrusion sensor 600 and transponder 100 are mounted. Whileidentified separately, the intrusion sensor 600 and transponder 100 maybe physically integrated into the same physical package. In a patterndetermined by the layout of the house or building into which thesecurity network 400 is to be installed, one or more base units 200 aremounted. Each base unit 200 is in wireless communications with one ormore transponders 100. Each base unit 200 is also in communications withone or more other base units 200, each of which may contain a controllerfunction 250. In general, each base unit 200 is responsible for thetransponders 100 in a predetermined communications range of each baseunit 200. As is well understood to those skilled in the art, the rangeof wireless communications is dependent, in part, upon manyenvironmental factors in addition to the specific design parameters ofthe base units 200 and transponders.

[0088] According to US Census Bureau statistics, the median size ofone-family houses has ranged from 1,900 to 2,100 square feet (176 to 195square meters) in the last ten years, with approximately two-thirdsunder 2,400 square feet (223 square meters). This implies typical roomsin the house of 13 to 20 square meters, with typical wall lengths ineach room ranging from 3 to 6 meters. It is likely in many residentialhomes that most installed base units 200 will be able to communicatewith transponders in multiple rooms. Therefore, in many cases with thissystem it will be possible to install fewer base units 200 than majorrooms in a building, creating a security network 400 with excellentspatial antenna diversity as well as redundancy in the event of singlecomponent failure.

[0089] Base units 200 will typically communicate with other base units200 as well as passive transponders 150 using frequencies in one or moreof following unlicensed frequency bands: 902 to 928 MHz, 2435 to 2465MHz, 2400 to 2483 MHz, or 5725 to 5850 MHz. These bands permit the useof unlicensed secondary transmitters, and are part of the bands thathave become popular for the development of cordless phones and wirelessLAN networks, thereby leading to the wide availability of many low costcomponents. Three of the FCC rule sets applicable to the presentinvention will be discussed briefly.

[0090] Transmissions regulated by FCC rules 47 CFR 15.245 permit fielddisturbance sensors with field strengths of up to 500 mV/m at 3 meters(measured using an average detector function; the peak emission limitmay be up to 20 dB higher). This implies an averaged transmission powerof 75 mW and a peak transmission power of up to 7.5 Watts. Furthermore,transmissions under these rules do not suffer the same duty cycleconstraints as existing wireless security system transmitters operatingunder 47 CFR 15.231(a). This rule section would only apply when a baseunit 200 is communicating with a passive transponder 150 usingbackscatter modulation, which qualifies the base unit 200 as a fielddisturbance sensor. Prior art wireless security system transmitters arenot field disturbance sensors.

[0091] Transmissions regulated by FCC rules 47 CFR 15.247 permitfrequency hopping (FHSS) or digital modulation (DM) systems attransmission powers up to 1 Watt into a 6 dBi antenna, which results ina permitted 4 Watt directional transmission. In order for a FHSS deviceto take advantage of the full permitted power, the FHSS device mustfrequency hop at least once every 400 milliseconds.

[0092] Transmissions regulated by FCC rules 47 CFR 15.249 permit fieldstrengths of up to 50 mV/m at 3 meters (measured using an averagedetector function; the peak emission limit may be up to 20 dB higher).This implies an averaged transmission power of 750 μW and a peaktransmission power of up to 75 mW. Unlike 47 CFR 15.247, rule section 47CFR 15.249 does not specify modulation type or frequency hopping.

[0093] Most other products using these unlicensed bands are othertransient transmitters operating under 47 CFR 15.247 and 47 CFR 15.249,and so even though it may seem that many products are available and inuse in these bands, in reality there remains a lot of available space inthe band at any one instant in time, especially in residential homes.Most transmitters operating under 47 CFR 15.247 are frequency hoppingsystems whereby the given spectrum is divided into channels of aspecified bandwidth, and each transmitter can occupy a given channel foronly 400 milliseconds. Therefore, even if interference occurs, the timeperiod of the interference is brief. In most cases, the base units 200can operate without incurring interference or certainly withoutsignificant interference. In residential homes, the most common productusing these bands are cordless telephones, for which there are nostandards (other than the 47 CFR 15.247 requirements). Each phonemanufacturer uses its own modulation and protocol format. For datadevices, there are several well known standards that use the 2400 to2483 MHz band, such as 802.11, 802.11b (WiFi), Bluetooth, ZigBee(HomeRF-lite), and IEEE 802.15.4, among others.

[0094] The present invention has a substantial advantage of theaforementioned products in that many of the physical embodiments of thebase units 200 are fixed. Other products such as cordless phones andvarious data devices usually have at least one handheld, usually batterypowered, component. The FCC's Maximum Permitted Exposure (MPE)guidelines, described in OET 65, generally cause manufacturers to limittransmission power of handheld devices to 100 mW or less. Since mostwireless links are symmetrical, once the handheld device (such as thecordless phone) is power limited, any fixed unit (such as the cordlessbase unit) is also limited in power to match the handheld device. Giventhat many of the physical embodiments of the base units 200 of thesecurity network 400 are not handheld, they can use the full powerpermitted by the FCC rules and still meet the MPE guidelines.

[0095] As discussed earlier, the preferred means of communications byand between base units 200 is high power RF communications. Theinvention is not limiting, and modulation formats and protocols usingeither FHSS or DM can be employed. As one example, the high power RFcommunications can use Gaussian Frequency Shift Keyed (GFSK) modulationwith FHSS. This particular modulation format has already been used quitesuccessfully and inexpensively for Bluetooth, 802.11, and other datasystems to achieve raw data rates on the order of 1 Mbps. In order totake maximum advantage of the permitted power limits in, for example,the 2400 to 2483 MHz band, if a FHSS protocol is chosen, GFSK orotherwise, at least 75 hopping channels should be used and if a DMprotocol is chosen, a minimum 6 dB bandwidth of 500 KHz should be used.Any designer of a security network 400 under this invention can takeadvantage of the fixed nature of the base units 200 as well as therelatively low information rate requirements to select a modulationformat and protocol with high link margins.

[0096] One approach that a designer may consider is a multi-rate designwherein the high power RF communications uses different data rates fordifferent types of data. For example, the day to day management of thesecurity network 400 may involve a low volume of commands and messages.The link margins can be improved by implementing a lower data rate.Certain base units, such as those including a camera 213, may have highrate requirements that are only required when actually transferring apicture. Therefore, it is possible to design a protocol where the linkruns at a higher rate for certain transfers (i.e. pictures) and a lowerrate for normal communications. It should be noted that most otherproducts in these bands have at least one mobile component and high datarates are required. Therefore, in spite of the presence of otherproducts, the high power RF communications used in the security network400 should achieve higher reliability and range, and lowersusceptibility to interference than other collocated products.

[0097] When using high power RF communications, the base units 200function as a network of nodes. A message originating on one base unit200 may pass through intermediate base units 200 before terminating onthe destination base unit, as shown in FIGS. 23C and 10. The base units200 determine their own network topology based upon the ability of eachbase unit 200 to reliably transmit and/or receive the transmissionsto/from other base units. As discussed herein, the antennas 206 used inthese base units 200 may be directional, and therefore it is not alwayscertain that each base unit 200 can directly transmit to and receivefrom every other base unit 200. However, given the power limits andexpected distribution of devices in typical homes and buildings, it canbe generally expected that each base unit 200 can communicate with atleast one other base unit, and that the base units 200 can then form forthemselves a network that enables the routing of a message from any onebase unit 200 to any other base unit 200. Networking protocols are wellunderstood in the art and therefore not covered here. The base units 200described herein typically may use a unique (at least within the homeand neighbor security networks 400) originating and destination addressof each base unit 200 in the header of each message sent in routingmessages within the security network 400.

[0098] While the base units 200 use 47 CFR 15.247 rules for their highpower RF communications with each other, the base units 200 can use both47 CFR 15.245 and 47 CFR 15.247 rules for its wireless communicationswith passive transponders 150. Thus, the base units 200 can communicateto the transponders using one protocol, at a maximum power of 4 W forany length of time, and then switch to a second protocol, if desired, ata maximum power of 7.5 W to obtain a response from a passive transponder150. While the base unit 200 can transmit at 7.5 W for only 1 ms underthe 47 CFR 15.245, that time period is more than enough to obtain tensor hundreds of bits of data from a transponder 100. The extra permitted2.7 dB of power under 47 CFR 15.245 is useful for increasing the rangeof the base unit 200. In a related function, the base unit 200 can usethe longer transmission times at 4 W to deliver power to thetransponders 100, as described elsewhere, and reserve the brief burstsat 7.5 W only for data transfer.

[0099] Each base unit 200 typically receives communications from one ormore passive transponders 150 using modulated backscatter techniques. Touse modulated backscatter, a base unit 200 transmits a wireless signalto a passive transponder 150. The passive transponder 150 modulates theimpedance of its antenna, thereby altering reflections of the wirelesssignal off its antenna. The base unit 200 then detects the changes inreflected signal. The impedance changes are made using a predeterminedrate whose frequency can be measured by the base unit 200 to distinguishdata bits.

[0100] These techniques are very well understood by those skilled in theart, and have been well discussed in a plethora of literature includingpatent specifications, trade publications, marketing materials, and thelike. For example, the reader is directed to RFID Handbook.Radio-Frequency Identification: Fundamentals And Applications, by KlausFinkenzeller, published by John Wiley, 1999. U.S. Pat. No. 6,147,605,issued to Vega et al, provides additional material on the design andtheory of modulated backscatter techniques. U.S. Pat. No. 6,549,064,issued to Shanks et al, also provides material on the design and theoryof modulated backscatter techniques. Therefore, this same material isnot covered here. Presently, a number of companies produce miniaturizedchipsets, components, and antennas for base units 200 and transponders.Many of these chipsets, though designed for the 13.56 MHz band, areapplicable and/or will be available in the higher bands such as thosediscussed here. For example, Hitachi has recently announced themanufacture of its mu-chip, which is a 2.4 GHz transponder 100 measuringonly 0.4 mm square. The most important point here is that the wideavailability of parts permits the designer many options in choosing thespecific design parameters of the base unit 200 and passive transponder150 and therefore the innovative nature of this invention is not limitedto any specific circuit design implementing the wireless link betweenthe base unit 200 and passive transponder 150.

[0101] The extensive literature on backscatter modulation techniques andthe wide availability of parts does not detract from the innovativeapplication and combination of these techniques and parts to the presentinvention. Most applications of backscatter modulation have been appliedto mobile people, animals, or things that must be authorized, tracked,counted, or billed. No one has previously considered the novelapplication of low cost backscatter modulation components to solve theproblem of monitoring fixed assets such as the windows 702, doors 701,and other sensors 600 and 620 that comprise the openings of buildings.All present transmitters constructed for prior art wireless securitysystems are more expensive than the backscatter modulation-based designof the present invention because of the additional components requiredfor active transmission. Furthermore, no one has considered the use ofmultiple, distributed low cost base units 200 with overlapping coverageso that a building's security is not dependent on a single, vulnerable,and historically unreliable central transceiver.

[0102] There are several examples of the advantages that the presentbackscatter modulation approach offers versus prior art wirelesssecurity systems. Prior art wireless security systems limit statusreporting by transmitters to times even longer than the FCC restrictionof once per hour in order to conserve the battery in the transmitter.The backscatter modulation approach herein does not have the samebattery limitation because of the modulated backscatter design. Priorart wireless security systems are subject to both false positive andfalse negatives indications because centrally located transceivers havedifficulty distinguishing noise from real signals. The centraltransceiver has little control over the time of transmission by atransmitter and therefore must evaluate every signal, whether noise,interference, or real transmission. This is made more difficult becausethe prior art central transceivers are not always located centrally inthe house. Professional installers generally hide these centraltransceivers in a closet or similar to prevent an intruder from easilyspotting the central transceivers and disabling it. Each wall or doorthrough which signals must pass to reach a central transceiver cantypically cause a loss of up to 10 dB in signal power. In contrast, thebackscatter modulation approach places all of the transmission controlin the master controller 251 and base unit 200. The base unit 200 onlylooks for a return response during a read. Therefore the base unit 200can be simpler in design.

[0103] Some centralized transceivers attempt to use diversity antennasto improve their reliability; however, these antennas are separated onlyby the width of the packaging, which is frequently much less than onewavelength of the chosen frequency (i.e. 87 cm at 345 MHz and 69 cm at433 MHz). As is well known to those skilled in the art of wireless,spatial diversity of antennas works best when the antennas are separatedby more than one wavelength at the chosen frequency. With the presentinvention, base units 200 are separated into multiple rooms, creatingexcellent spatial diversity and the ability to overcome environmentalaffects such as multipath and signal blockage. Multipath and signalblockage are effects of the RF path between any transmitter andreceiver. Most cellular systems use diversity antennas separated bymultiple wavelengths to help overcome the effects of multipath andsignal blockage. Under the present invention, in most installationsthere will be multiple base units 200 in a building. There willtherefore be an independent RF path between each base unit 200 and eachtransponder 100. The master controller 251 may sequence transmissionsfrom the base units 200 so that only one base unit 200 is transmittingat a time. Besides reducing the potential for interference, this allowsthe other base units 200 to listen to both the transmitting base unit200 and the subsequent response from the transponders. If the RF pathbetween the transmitting base unit 200 and the transponder 100 issubject to some form of multipath or signal blockage, it is possible andeven highly probable that one of the remaining base units 200 arecapable of detecting and interpreting the signal. If the transmittingbase unit 200 is having trouble receiving an adequate response from aparticular transponder 100, the master controller 251 may then poll theremaining base units 200 to determine whether the response was receivedby any of them.

[0104] One major design advantage of the present invention versus allother applications of backscatter modulation is the fixed and staticrelationship between each base unit 200 and the transponders. While RFIDreaders for other applications must include the complexity to deal withmany simultaneous tags in the read zone, tags moving rapidly, or tagsonly briefly in the read zone, the present invention can take advantageof controlled static relationship in the following ways.

[0105] While there may be multiple transponders 100 in the read zone ofeach base unit, the base unit 200 can poll each transponder 100individually, preventing collisions or interference. In addition,because each transponder 100 is responding individually, the base unit200 can use the expected response bit sequence to improve the receiveprocessing gain. A specific transponder 100 is responding at a specifictime, and at least a portion of the response will contain bits in apredetermined sequence.

[0106] Because the transponders 100 are fixed, the base unit 200 can uselonger integration times in its signal processing to increase thereliability of the read signal, permitting successful reading at longerdistances and lower power when compared with backscatter modulationapplications with mobile tags.

[0107] Furthermore, the base unit 200 can make changes in specificfrequency while remaining within the specified unlicensed frequencyband, in an attempt to find, for each transponder 100, an optimal centerfrequency, given the manufacturing tolerances of the components in eachtransponder 100 and any environment effects that may be creating moreabsorption or reflection at a particular frequency. In a similar manner,the base unit 200 can learn the center frequencies of the marking andspacing bits modulated by each transponder 100. While these centerfrequencies may be nominally known and designed into the transponder100, there is likely a significant probability that the manufacturingprocess will result in a variation of actual modulation frequencies. Bymatching its demodulation process to each transponder 100, the base unit200 can improve its signal processing margin.

[0108] Because the multiple base units 200 are controlled from a singlemaster controller 251, the controller function 250 can sequence the baseunits 200 in time so that the base units 200 do not interfere with eachother.

[0109] Because there will typically be multiple base units 200 installedin each home, apartment, or other building, the controller function 250can use the excellent spatial diversity created by the distributednature of the base units 200 to increase and improve the reliability ofeach reading operation. That is, one base unit 200 can initiate thetransmission sequence, but multiple base units 200 can tune and read theresponse from the transponder 100. Thus the multiple base units 200 canoperate as a network of receivers to demodulate and interpret theresponse from the transponder 100.

[0110] Because the transponders 100 are typically static, and becausethe events (such as intrusion) that affect the status of the sensorsconnected to transponders 100 are relatively slow compared to the speedof electronics in the base units, the base units 200 have theopportunity to pick and choose moments of low quiescent interferencefrom other products in which to perform its reading operations withmaximum signal to noise ratio potential—all without missing the eventsthemselves.

[0111] Because the path lengths and path loss from each transponder 100to the base unit 200 are relatively static, the base unit 200 can usedifferent power levels when communicating with each transponder 100.Lower path losses require lower power to communicate; conversely thebase unit 200 can step up the power, within the specified limits of theFCC rules, to compensate for higher path losses. The base unit 200 candetermine the lowest power level to use for each transponder 100 bysequentially stepping down its transmit power on successive readingoperations until no return signal can be detected. Then the power levelcan be increased one or two incremental levels. This determined levelcan then be used for successive reading operations. This use of thelowest necessary power level for each transponder 100 can help reducethe possibility of interference while ensuring that each transponder 100can always be read.

[0112] Finally, for the same static relationship reasons, the mastercontroller 251 and base units 200 can determine and store the typicalcharacteristics of transmission between each transponder 100 and eachbase unit 200 (such as signal power, signal to noise ratio, turn ontime, modulation bit time, etc.), and determine from any change in thecharacteristics of transmission whether a potential problem exists.Thus, the base unit 200 can immediately detect attempts to tamper withthe transponder 100, such as partial or full shielding, deformation,destruction, or removal.

[0113] By taking advantage of the foregoing techniques, the base unit200 of the present invention can support a wireless range of up to 30meters when communicating with passive transponders 150, depending uponthe building construction materials, placement of each base unit 200 ina room, and the furniture and other materials in the room which may havecertain reflective or absorptive properties. This range is more thansufficient for the majority of homes and other buildings in the targetmarket of the present security network 400.

[0114] Base units 200 may include receivers or transceivers 205 in orderto communicate with transponders 100 using low power RF communications.Transponders 100 using low power RF communications will typicallytransmit using the 300 to 500 MHz band and will typically be operatingunder FCC rule 47 CFR 15.231. In particular, frequencies at or near 315,319, 345, and 434 MHz have been historically favored for low power RFtransmitters and many components are available for constructingtransponders 100 that operate at these frequencies. As discussedearlier, prior art wireless security systems suffer from limitationscaused by the low power and intermittent nature of the transmissionsfrom transponders operating under this rule section, coupled with thecentral receiver architecture of these prior art systems.

[0115] The present invention has a number of design advantages overprior art wireless security systems, even when using transponders 100operating under the limitations of FCC rule 47 CFR 15.231. The followingadvantages apply for a security network 400 wherein the base units 200include receivers or transceivers in order to communicate withtransponders 100 using low power RF communications.

[0116] The security network 400 permits the installation of multiplebase units 200. These base units 200 can be installed in various roomsof a building, in a neighboring building, or in a nearby outbuilding.The base units 200 in the security network 400 form a spatially diversenetwork of receivers or transceivers. This spatial diversity provides asignificant increase in reliability when compared with the limitedantenna diversity of prior art wireless security systems. FIG. 21 showsan example curve relating the number of base units 200 (in the presentinvention base units 200 contain the receivers receiving communicationsfrom transponders 100; in prior art systems other terms may be used forthe wireless receivers) to the probability of message loss in thesecurity network 400. It can be seen that increasing the number ofreceivers, especially in a spatially diverse manner, dramaticallydecreases the probability of message loss. Prior art systems willgenerally experience losses in the vicinity of point A in FIG. 21, whilethe security network 400 can easily operate in the vicinity of point B.

[0117] The RF propagation path from each transponder 100 to each baseunit 200 is statistically independent, therefore even if signalblockage, interference, or multipath is affecting one RF propagationpath, there will be a statistically high probability that the other RFpropagation paths will not be simultaneously experiencing the sameproblem. Furthermore, there will be a different path length from eachtransponder 100 to each base unit, increasing the likelihood that atleast one base unit 200 can receive a message transmitted by atransponder 100 with sufficient signal to noise. Each base unit 200 willattempt to receive and demodulate the intended transponder 100 message,creating a base unit-specific version of the message. Furthermore, eachbase unit 200 may determine certain quality factors associated with itsversion of the message. These quality factors may be based upon receivedsignal strength, received signal to noise or signal to interferenceratios, received errors or error detection/recovery codes, or othersimilar factors. The versions may differ somewhat based upon theproblems that may have experienced on each RF propagation path from thetransponder 100 to each base unit 200. Each base unit 200 may use highpower RF communications to send its base unit-specific version of themessage that it received from a transponder 100 to a controller function250, and the controller function 250 may compare portions of thedifferent base unit-specific versions of the transponder 100 message inorder to determine the most likely correct version of the intendedtransponder 100 message. If necessary, the controller function 250 cancombine portions of multiple base unit-specific versions of the messagetogether in order to form or reconstruct the intended transponder 100message.

[0118] Base units 200 belonging to different security networks 400 maybe within wireless communications range of each other. For example, twoneighboring homes or buildings may each have a security network 400installed. A base unit 200 in a first security network 400 in a firstresidence in FIG. 17 may receive low power RF communications from atransponder 100 in a second security network 400 in a second residence741 in FIG. 17. The base unit 200 in the first security network 400 maybe configured to use high power RF communications to send its version ofthe message that the first base unit 200 received from the transponder100 in the second security network 400 to a controller function 250 in abase unit 200 in the second security network 400. Thus nearby securitynetworks 400 may cooperate with each other in receiving low power RFcommunications from transponders 100.

[0119] Since base units 200 include processors 203 and memory 211, thebase units 200 may also include receivers that incorporate signalprocessing gain to improve the reception of low power RF communicationsfrom transponders 100. Prior art wireless security systems use receiversthat attempt to demodulate low power RF communications on a symbol bysymbol basis. That is, the receivers in prior art wireless securitysystems demodulate each symbol independently of each other symbol in themessage. Certain symbols may be demodulated correctly while othersymbols may not be demodulated correctly. The base units 200 of thepresent invention may use signal processing techniques whereby the baseunit 200 may receive multiple symbols within the message transmitted bythe transponder 100 and then compare the multiple symbols against anexpected set of symbols. This process of comparison is sometimes knownin the art as integration or correlation, and the result is animprovement in message demodulation due to signal processing gain. Theintegration may be coherent or incoherent. For an example message lengthof 64 bits, coherent integration can result in a signal processing gainof 10 log 64, or 18 dB. This means that a base unit 200 can have areceive sensitivity that is as much as 18 dB better than the receiver ina prior art wireless security system.

[0120] Every base unit 200 will typically support both high power RFcommunications with other base units 200 and communications withtransponders 100. Some base units 200 may support additional functionsas discussed elsewhere. FIG. 3 shows a block diagram of an exampleembodiment of the base unit 200. Typically, the base unit 200 includes amicroprocessor 203, memory 211, unit specific software, RF modulationand receiving circuits 204, an antenna 206, and power supply 207. Themicroprocessor 203 and RF modulation and receiving circuits 204 may beincorporated as a single chipset or discretely separated.

[0121] One manner in which to build a low cost base unit 200 is to usean integrated cordless phone chipset combined with a limited number ofadditional components. However, other base units 200 can also be builtusing discrete mixers, filters, amplifiers, etc. that are not integratedinto a single chipset. While FIG. 3 shows only a single antenna 206 forsimplicity, it may be advantageous for the base unit 200 to contain morethan one antenna to provide increased diversity, directivity, orselectivity. When more than one antenna is present, the RF modulationand/or receiving circuits 204 may enable the switching between themultiple antenna elements 206. Alternately, the design may includeseparate RF modulation and/or receiving circuits 204 for each antennaelement. This may help provide greater separation for the transmit andreceive signals. If the base unit 200 is to also include a controllerfunction 250, the microprocessor 203 will also require sufficient memory211 for program and data storage.

[0122] Base units 200 can be implemented for use with transponders 100that employ low power RF communications or passive transponders 150 thatemploy backscatter modulation. Within a single security network 400,typically all transponders 100 would commonly use only onecommunications type or the other. Therefore, the RF modulation andreceiving circuits 204 of the base unit 200 should typically reflect theselected communications type for the transponders 100 in the particularsecurity network 400. If the transponders 100 in the security network400 employ low power RF communications, then the RF modulation and/orreceiving circuits must support both high power RF communications 204and low power RF communications 205. If the transponders in the securitynetwork 400 employ backscatter modulation (i.e. they are passivetransponders 150), then the RF modulation and/or receiving circuits willtypically be required to only support high power RF communications 204.

[0123] If battery backup is desired, the packaging of the base unit 200also permits the installation of a battery 208 for backup purposes incase normal power supply 207 is interrupted. It is also possible toconstruct an embodiment without a local power supply 207 and that runsentirely from a battery 208. One such embodiment may take a physicalform similar to a cordless phone handset 260.

[0124] The inventive base unit 200 need not be limited to any particularmodulation scheme for either its high power RF communications or supportfor backscatter modulation by a passive transponder 150. The choice ofthe microprocessor 203, RF modulation and/or receiving circuits 204, andantenna 206 may be influenced by various modulation considerations. Forexample, because the base unit 200 and transponder 100 may operate inone of the shared frequency bands allocated by the FCC, these devices,as do all Part 15 devices, are required to accept interference fromother Part 15 devices. It is primarily the responsibility of the baseunit 200 to manage communications with the transponder 100, andtherefore the following are some of the capabilities that may beincluded in the base unit 200 to mitigate interference.

[0125] Passive transponders 150 use backscatter modulation, whichalternately reflects or absorbs the signal radiated by the base unit 200in order to send its own data back. Therefore, a passive transponder 150will automatically follow, by design, the specific frequency andmodulation used by the base unit 200. This is a significant advantageversus prior art wireless security system transmitters, which can onlytransmit at a single modulation scheme with its carrier centered at asingle frequency. If interference is encountered at or near that singlefrequency, these transmitters of prior art wireless security system haveno ability to alter their transmission characteristics to avoid ormitigate the interference.

[0126] A base unit 200 can be implemented to support any of thefollowing modulation schemes, though the present invention is notlimited to just these modulation schemes. As is well known in the art,there are many modulation techniques and variations within any onemodulation technique, and designers have great flexibility in makingchoices in this area. The simplest is a carrier wave (CW) signal, at avariety of frequency choices within the allowable bandwidth. A CWconveys no information from the base unit 200 to a passive transponder150, but allows a passive transponder 150 to modulate return signaldescribed herein. The base unit 200 would typically use anothermodulation scheme such as Binary Phase Shift Keyed (BPSK), GaussianMinimum Shift Keyed (GMSK), Gaussian Frequency Shift Keyed (GFSK) oreven on-off keyed (OOK) AM, when sending data to a transponder 100, butcan use CW when expecting a return signal. The base unit 200 canconcentrate its transmitted power into this CW, permitting thisnarrowband signal to overpower a portion of the spread spectrum signaltypically used by other devices operating in the unlicensed bands. Ifthe base unit 200 is unsuccessful with CW at a particular frequency, thebase unit 200 can shift frequency within the permitted band. As stated,under the present invention a passive transponder 150 will automaticallyfollow the shift in frequency by design. Rather than repeatedlygenerating CW at a single frequency, the base unit 200 can alsofrequency hop according to any prescribed pattern. The pattern may bepredetermined or pseudorandom. This pattern can be adaptive and can bevaried, as needed to avoid interference.

[0127] There may be times when the interference experienced by the baseunit 200 is not unintentional and not coming from another Part 15device. One means by which a very technically knowledgeable intruder mayattempt to defeat the security network 400, or any wireless system, ofthe present invention is by intentional jamming. Jamming is an operationby which a malicious intruder independently generates a set of radiotransmissions intended to overpower or confuse legitimate transmissions.In this case, the intruder would likely be trying to prevent one or moretransponders from reporting a detected intrusion to the base unit, andthen to the master controller 251. Jamming, is of course, illegal underthe FCC rules; however intrusion itself is also illegal. In alllikelihood, a person about to perpetrate a crime may not give anyconsideration to the FCC rules. Therefore, the base unit 200 may alsocontain algorithms that can determine within a reasonable probabilitythat the base unit 200 is being subjected to jamming. For example, ifone or more base units 200 detect a change in the radio environment, ina relatively short predetermined period of time, wherein attemptedchanges in modulation schemes, power levels, and other parameters areunable to overcome the interference, the master controller 251 can causean alert indicating that it is out of communications with one or moretransponders with the likely cause being jamming. This condition can bedistinguished from the failure of a single transponder I 00 by asimultaneous and parallel occurrence of the change in RF environment,caused by signals not following known FCC transmission rules for power,duty cycle, bandwidth, modulation, or other related parameters andcharacteristics. The alert can allow the building owner or emergencyresponse agency 460 to decide upon an appropriate response to theprobable jamming.

[0128] Many homeowners desire monitoring of their security networks 400by an alarm services company 460. The inventive security network 400permits monitoring as well as access to various external networks 410through a family of devices known as gateways 300, each of which permitsaccess from the security network 400 to external devices and networksusing different protocols and physical connection means. A gateway 300is a base unit 200 with an added telecommunications interface. Eachgateway 300 is configured with appropriate hardware and software thatmatch the external network 410 to which access is desired. As shown inFIGS. 16 and 7, examples of external networks 410 to which access can beprovided are private Ethernets 401, CMRS 402, PSTN 403, WiFi 404, andthe Internet 405. This list of external networks 41 0 is not meant to belimiting, and appropriate hardware and software can be provided toenable the gateway 300 to access other network formats and protocols aswell. Private Ethernets 401 are those which might exist only within abuilding or residence, servicing local computer terminals 450. If thegateway 300 is connected to a private Ethernet 401, access to theInternet 405 can then be provided through a cable modem 440, DSL 441, orother type of broadband network 442. There are too many suppliers toenumerate here.

[0129] A block diagram of the gateway 300 is the same as that of thebase unit shown in FIG. 3. Typically, the gateway 300 includes amicroprocessor 203, memory 211, unit specific software, RF modulationand receiving circuits 204, an antenna 206, and power supply 207. Themicroprocessor 203 and RF modulation and receiving circuits 204 may beincorporated as a single chipset or discretely separated. Thetelecommunications interface 220 will vary depending upon the externalnetwork to which the gateway 300 is to connect. The gateway 300 willtypically communicate with the base units 200 using high power RFcommunications.

[0130] As shown in FIGS. 16 and 20, the security network 400 permits theinstallation of multiple gateways 300 in a single security network 400,each of which can interface to the same or different external networks410. For example, a second gateway 300 can serve to function as analternate or backup gateway 300 for cases in which the first gateway 300fails, such as component failure, disablement or destruction by anintruder, or loss of power at the outlet where the first gateway 300 isplugged in. If there are multiple gateways installed in a securitynetwork 400, these gateways may be located in different buildings and beconnected to different networks. For example, a user may install asecurity network 400 including a gateway 300 in their residence 740 andthen also place a second gateway 300 in their neighbor's residence 741.The first gateway 300 is then connected to one telephone line and thesecond gateway 300 is then connected to the neighbor's telephone line.(FIG. 17)

[0131] Homeowners and building owners generally desire one or two typesof alerts in the event that an intrusion is detected. First, an audiblealert may be desired whereby a loud siren 551 is activated both tofrighten the intruder and to call attention to the building so that anypassers-by may take notice of the intruder or any evidence of theintrusion. However, there are also scenarios in which the building ownerprefers the so called silent alert whereby no audible alert is made soas to lull the intruder into believing he has not been discovered andtherefore may still be there when law enforcement personnel arrive. Thesecond type of alert involves messaging an emergency response agency460, indicating the detection of an intrusion and the identity of thebuilding, as shown in FIGS. 8 and 16. The emergency response agency 460may be public or private, depending upon the local customs, and so, forexample, may be an alarm services company 460 or the city policedepartment 460.

[0132] The gateway 300 of the inventive system supports the second typeof foregoing alert by preferably including different telecommunicationsinterfaces 220, or modules, such as for example a modem module 310,wireless module 311 and 312, WiFi module 313, or Ethernet module 313.The modem module 310 is used for connection to a public switchedtelephone network (PSTN) 403; the wireless module 311 is used forconnection to a commercial mobile radio service (CMRS) network 402 suchas any of the widely available CDMA, TDMA, or GSM-based 2G, 2.5G, or 3Gwireless networks. The WiFi module 313 is used for connection to privateor public WiFi networks 404; the Ethernet module 313 is use forconnection to private or public Ethernets 401.

[0133] Certain building owners will prefer the high security leveloffered by sending an alert message through a CMRS network 402 or WiFinetwork 404. The use of a CMRS network 402 or WiFi network 404 by thegateway 300 overcomes a potential point of failure that occurs if theintruder were to cut the telephone wires 431 prior to attempting anintrusion. If the building owner has installed at least two gateways 300in the system, one gateway 300 may have a wireless module 311/312installed and a second may have a modem module 310 installed. Thisprovides the inventive security network 400 with two separatecommunication paths for sending alerts to the emergency response agency460 as shown in FIG. 8. By placing different gateways 300 (FIGS. 16 and20) in very different locations in the building, the building ownersignificantly decreases the likelihood that an intruder can discover anddefeat the security network 400.

[0134] Any base unit 200, including gateways 300, may include acontroller function 250. Prior art alarm panels typically contain asingle controller, and all other contacts, motion detectors, etc. arefairly dumb from an electronics and software perspective. For thisreason, the alarm panel must be hidden in the house because if the alarmpanel were discovered and disabled, all of the intelligence of thesystem would be lost. The controller function 250 of the presentinvention may be distributed through many or all of the base units 200in the security network 400 and shown in FIG. 9. The controller function250 is a set of software logic that can reside in the processor 203 andmemory 211 of a number of different base units 200 within the securitynetwork 400, including within the base unit 200. If the base unit 200memory is of an appropriate type and size, the memory 211 can contain acontroller function 250, consisting of both program code andconfiguration data. The program code will generally contain bothcontroller function 250 code common to all devices as well as codespecific to the base unit 200 type. For example, a base unit 200 willhave certain device specific hardware that requires matching code, and agateway 300 may have different device specific hardware that requiresdifferent matching code.

[0135] When multiple base units 200 are installed in a system, thecontroller functions 250 in the different devices become aware of eachother, and share configuration data and updated program code. Theupdated program code can consist of either a later released version ofthe program code, or can consist of device specific code or parameters.For example, if a new type of base unit 200 is developed and theninstalled into an existing network, the older base units 200 in thesystem may require updated program code or parameters in order toeffectively manage the new base unit 200.

[0136] Each controller function 250 in each device can communicate withall other controller functions 250 in all other base units 200 as shownin FIG. 9. The purpose of replicating the controller function 250 onmultiple base units 200 is to provide a high level of redundancythroughout the entire security network 400, and to reduce or eliminatepossible points of failure (whether component failure, power failure, ordisablement by an intruder). The controller functions 250 implemented oneach base unit 200 perform substantially the same common functions,therefore the chances of system disablement by an intruder are fairlylow.

[0137] When there are multiple controller functions 250 installed in asingle security network 400, the controller functions 250 arbitrateamong themselves to determine which controller function 250 shall be themaster controller 251 for a given period of time. The preferredarbitration scheme consists of a periodic self-check test by eachcontroller function 250, and the present master controller 251 mayremain the master controller 251 as long as its own periodic self-checkis okay and reported to the other controller functions 250 in thesecurity network 400. If the present master controller 251 fails itsself-check test, or has simply failed for any reason or been disabled,and there is at least one other controller function 250 whose self-checkis okay, the failing master controller 251 will abdicate and the othercontroller function 250 whose self-check is okay will assume the mastercontroller 251 role. In the initial case or subsequent cases wheremultiple controller functions 250 (which will be ideally be the usualcase) are all okay after periodic self-check, then the controllerfunctions 250 may elect a master controller 251 from among themselves byeach choosing a random number from a random number generator, and thenselecting the controller function 250 with the lowest random number.There are other variations of arbitration schemes that are widely known,and any number are equally useful without deducting from theinventiveness of permitting multiple controller functions 250 in asingle security network 400, as long as the result is that in a multi-controller function 250 system, no more than one controller function 250is the master controller 251 at any one time. In a multi-controllerfunction 250 system, one controller function 250 is master controller251 and the remaining controller functions 250 are slave controllers,keeping a copy of all parameters, configurations, tables, and status butgenerally not duplicating the actions of the master controller 251.

[0138] In a system with multiple controller functions 250, the securitynetwork 400 can receive updated program code and selectively update thecontroller function 250 in just one of the base units. If the singlebase unit 200 updates its program code and operates successfully, thenthe program code can be updated in other base units. If the first baseunit 200 cannot successfully update its program code and operate, thenthe first base unit 200 can revert to a copy of older program code stillstored in other base units. Because of the distributed nature of thecontroller functions 250, the security network 400 of the presentinvention does not suffer the risks of prior art alarm panels which hadonly one controller.

[0139] Each controller function 250 typically performs some or all ofthe following major logic activities, although the following list is notmeant to be limiting:

[0140] configuration of the security network 400 whereby each of theother components are identified, enrolled, and placed under control ofthe master controller 251,

[0141] receipt and interpretation of daily operation commands executedby the homeowner or building occupants including commands whereby thesystem is placed, for example, into armed or monitoring mode or disarmedfor normal building use,

[0142] communications with other controller functions 250, if present,in the system including exchange of configuration information and dailyoperation commands as well as arbitration between the controllerfunctions 250 as to which controller function 250 shall be the mastercontroller 251,

[0143] communications with various external networks 410 for purposessuch as sending and receiving messages, picture and audio files, new orupdated program code 251, commands and responses, and similar functions,

[0144] communications with base units 200 and transponders 100 in thesecurity network 400 including the sending of various commands and thereceiving of various responses and requests,

[0145] processing and interpretation of data received from the baseunits 200 including data regarding the receipt of various signals fromthe sensors 600 and 620 and transponders 100 within communications rangeof each base unit,

[0146] monitoring of each of the sensors, both directly and indirectly,to determine, for example, whether a likely intrusion has occurred,whether glass breakage has been detected, or whether motion has beendetected by a microwave- and/or passive infrared-based device,

[0147] deciding, based upon the configuration of the security network400 and the results of monitoring activity conducted by the controllerfunction 250, whether to cause an alert or take another event basedaction,

[0148] causing an alert, if necessary, by some combination of audibleindication such as via a siren device 551, or using a gateway 300 todial through the public switched telephone network (PSTN) 403 to delivera message to an emergency response agency 460, or sending a messagethrough one or more ethernet, internet 405, and/or commercial mobileradio services (CMRS) 402 to an emergency response agency 460.

[0149] The controller function 250 offers an even higher level ofsecurity that is particularly attractive to marketing the inventivesecurity network 400 to apartment dwellers. Historically, securitysystems of any type have not been sold and installed into apartments forseveral reasons. Apartment dwellers are more transient than homeowners,making it difficult for the dweller or an alarm services company torecoup an investment from installing a system. Of larger issue, though,is the small size of apartments relative to houses. The smaller sizemakes it difficult to effectively hide the alarm panel of prior artsecurity systems, making it vulnerable to discovery and thendisconnection or destruction during the pre-alert period. The pre-alertperiod of any security system is the time allowed by the alarm panel forthe normal homeowner to enter the home and disarm the system by enteringan appropriate code or password into a keypad. This pre-alert time isoften set to 30 seconds to allow for the fumbling of keys, the carryingof groceries, the removal of gloves, etc. In an apartment scenario, 30seconds is a relatively long time in which an intruder can search theapartment seeking the alarm panel and then preventing an alert.Therefore, security systems have not been considered a viable option formost apartments. Yet, approximately 35% of the households in the U.S.live in apartments (or other multi-family dwelling units) and theirsecurity needs are not less important than those of homeowners.

[0150] The inventive security network 400 may include an additionalremote monitoring function in the controller function 250, which can beselectively enabled at the discretion of the system user. The controllerfunction 250 includes a capability whereby the controller function 250of one base unit 200 can send a message to a designated cooperating baseunit 200 at the time that a pre-alert period begins and again at thetime that the security network 400 has been disabled by the normal user,such as the apartment dweller, by entering the normal disarm code. Thedesignated cooperating base unit 200 may be located anywhere within RFrange of the first base unit 200 such as for example another apartment,another building, or a secure room within the building. Furthermore, thecontroller function 250 of one base unit 200 can send a differentmessage to the same designated cooperating base unit 200 if the normaluser enters an abnormal disarm code that signals distress, such as when,for example, an intruder has forced entry by following the apartmentdweller home and using a weapon to force the apartment dweller to enterher apartment with the intruder and disarm the security network 400.

[0151] In logic flow format, the remote monitoring function operates asshown in FIG. 12 and described in more detail below, assuming that thefunction has been enabled by the user:

[0152] An intrusion is detected in the building, such as the apartment,

[0153] the controller function 250 in a first base unit 200 begins apre-alert period,

[0154] the controller function 250 in the first base unit 200 sends amessage to a designated cooperating base unit 200 whereby the messageindicates the identity of the security network 400 and the transition topre-alert state,

[0155] the said designated cooperating base unit 200 begins a timer (forexample 30 seconds or any reasonable period allowing for an adequatepre-alert time),

[0156] if the person causing the intrusion is a normal user under normalcircumstances, the normal user will enter or speak the normal disarmcode or password,

[0157] the controller function 250 in the first base unit 200 ends thepre-alert period, and enters a disarmed state,

[0158] the controller function 250 in the first base unit 200 sends amessage to the said cooperating base unit 200, whereby the messageindicates the identity of the security network 400 and the transition todisarm state,

[0159] if the person causing the intrusion is an intruder who does notknow the disarm code and/or disables and/or destroys the first base unit200 containing the controller function 250 of the security network 400,

[0160] the timer at the said cooperating base unit 200 reaches themaximum time limit (30 seconds in this example) without receiving amessage from the controller function 250 in the first base unit 200indicating the transition to disarm state,

[0161] the said cooperating base unit 200 may remotely cause an alertindicating that a probable intrusion has taken place at the locationassociated with the identity of the security network 400,

[0162] if the person causing the intrusion is an authorized user underdistressed circumstances (i.e. gun to back), the authorized user entersor speaks an abnormal disarm code or password indicating distress,

[0163] the controller function 250 in the first base unit 200 sends amessage to the said cooperating base unit 200, whereby the messageindicates the identity of the security network 400 and the use of anabnormal disarm code or password indicating distress,

[0164] the said cooperating base unit 200 may remotely cause an alertindicating that an intrusion has taken place at the location associatedwith the identity of the security network 400 and that the authorizeduser is present at the location and under distress.

[0165] As can be readily seen, this inventive remote monitoring functionnow enables the installation of this inventive security network 400 intoapartments without the historical risk that the system can be rendereduseless by the discovery and disablement or destruction by the intruder.With this function enabled, even if the intruder were to disable ordestroy the system, a remote alert could still be signaled because amessage indicating a transition to disarm state would not be sent, and atimer would automatically conclude remotely at the designated processor.This function is obviously not limited to just apartments and could beused for any building.

[0166] With a wireless module 311 or 312, WiFi module 313, or Ethernetmodule 313 installed, a gateway 300 can also be configured to sendeither an SMS-based message through the CMRS 402 or an email messagethrough a WiFi network 404 or Ethernet network 401 to the Internet 405to any email address based upon selected user events. For example, anindividual away from home during the day may want a message sent to hispager, wireless phone, or office email on computer 450 if the inventivesecurity network 400 is disarmed at any point during the day when no oneis supposed to be at home. Alternately, a parent may want a message sentwhen a child has returned home from school and disarmed the securitynetwork 400. Perhaps a homeowner has provided a temporary disarm code orpassword to a service company scheduled to work in the home, and thehomeowner wants to receive a message when the work personnel havearrived and entered the home. By assigning different codes or passwordsto different family members and/or work personnel, the owner of thesecurity network 400 can discriminate among the persons authorized todisarm the system. Any message sent, as described herein, can contain anindication identifying the code/password and/or the person that enteredthe disarm code/password. The disarm code/password itself is typicallynot sent for the obvious security reasons, just an identifier associatedwith the code.

[0167] The gateway 300 can send or receive updated software, parameters,configuration, or remote commands, as well as distribute these updatedsoftware, parameters, configuration, or remote commands to othercontroller functions 250 embedded in other base units 200. For example,once the security network 400 has been configured, a copy of theconfiguration, including all of the table entries, can be sent to aremote processor 461 for both backup and as an aid to responding to anyreported emergency. If, for any reason, all of the controller functions250 within the security network 400 ever experienced a catastrophicfailure whereby its configuration were ever lost, the copy of theconfiguration stored at the remote processor 461 could be downloaded toa restarted or replacement controller function 250. Certain parameters,such as those used in glass breakage detection, can be downloaded to thecontroller function 250 and then propagated, in this example, to theappropriate glass breakage detection functions that may be containedwithin the system. Therefore, for example, if a homeowner wereexperiencing an unusual number of false alarm indications from a glassbreakage detection function, remote technical personnel could remotelymake adjustments in certain parameters and then download these said newparameters to the controller function 250. Additionally, the operatingparameters for new base units 200 can also be downloaded to thecontroller function 250. For example, if a homeowner added a new baseunit 200 to the security network 400 several years after initialinstallation, the parameters for this new type of base unit 200 mightnot exist in the controller function 250. The security network 400 couldobtain the parameters associated with the new base unit 200 from a sitedesignated by the manufacturer.

[0168] The controller function 250 can also report periodic statusand/or operating problems detected by the system to the emergencyresponse agency 460, the manufacturer of the system, or a similarentity. One example of the usefulness of this function is that reportsof usage statistics, status, and/or problems can be generated by anexample emergency response agency 460 and a copy be provided to thecustomer as part of his monthly bill. Furthermore, the usage statisticsof similarly situated customers can be compared and analyzed for anyuseful patterns. Technicians at an emergency response agency 460,manufacturer of the system, or similar entity can use any collected datato diagnose problems and make changes to the configuration, parameters,or software of security network 400 and remotely download these changesto the security network 400. This may eliminate the need for atechnician visit to a customer's home or other building.

[0169] Any base unit 200 may include an acoustic transducer 210 (shownin FIG. 3). The acoustic transducer 210 preferably supports both thereception of sounds waves and the emission of sound waves such that theacoustic transducer 210 can also be used for functions such as glassbreakage detection, fire alarm detection, two-way audio, the sounding oftones and alerts, voice recognition, and voice response (i.e. spokenword responses to commands). While shown as a single block in FIGS. 3,the acoustic transducer 210 can be implemented with a single combinedcomponent or with a separate input transducer (i.e. microphone) andoutput transducer (i.e. speaker and/or piezo).

[0170] It is preferred that microprocessor 203 be able to read acousticdata from the acoustic transducer 210 in order to analyze the data forspecific patterns. For example, it would be advantageous for themicroprocessor 203 to detect specific speech patterns for use in voicerecognition. Similarly, the microprocessor 203 may look for patternsthat indicate the sound of breaking glass or an alerting smoke detectoror fire alarm. It is also preferred that microprocessor 203 be able tosend acoustic data to the acoustic transducer 210 in order to createsounds for feedback or alerting, or to output pre-stored words for voiceresponse. The memory 211 should ideally contain sufficient data spacefor the storage of both patterns for recognition and output sounds andwords.

[0171] An example embodiment of a gateway 300 is a USB gateway 510. TheUSB gateway 510 includes common characteristics and embodiments with thebase unit 200 including high power RF communications and communicationswith transponders 100. Thus, if a USB gateway 510 has been installed ina room, it may not be necessary for a separate base unit 200 to also beinstalled in a room in order to monitor the transponders 100.

[0172] An interface mechanism available for use with the securitynetwork 400 is a USB gateway 510 that enables a desktop or laptopcomputer to be used for downloading, uploading, or editing theconfiguration stored in the controller functions 250. The USB gateway510 connects to and may obtain power from the Universal Serial Bus (USB)port commonly installed in most computers 450 today. The USB gateway 510can converts signals from the USB port to backscatter modulation or highpower RF communications with a base unit 200 or gateway 300, therebyproviding access to the configuration data stored by the controllerfunctions 250. A software program provided with the USB gateway 510enables the user to access the USB gateway 300 510 via the USB port, anddisplay, edit, or convert the configuration data. In this manner,authorized users have an easy mechanism to create labels for each of thebase units 200, gateways 300, and transponders. For example, aparticular transponder 100 may be labeled “Living Room Window” so thatany alert generated by the security network 400 can identify by labelthe room in which the intrusion has occurred. The labels created for thevarious devices can also be displayed on the display 266 to show, forexample, which zones are in an open or closed state.

[0173] Another example embodiment of a base unit 200 is an email device530. The security network 400 can support an email device 530 that useshigh power RF communications to communicate with the base units 200 andgateways 300. This email device 530, which can take the form of apalm-type organizer or other forms, may typically be used to send andreceive email via the modules a gateway 300. As described earlier, thevarious devices in the security network 400 self form a network, therebyenabling messages to originate on any base unit 200 and terminate on anycapable base unit 200. Therefore, it is not necessary that the emaildevice 530 be near a gateway 300. If necessary, messages can be receivedvia a gateway 300, be routed through multiple base units 200 and thenterminate at the email device 530. The primary advantage of including anemail device 530 in the security network 400 is to provide the homeownera device that is always on and available for viewing. There are agrowing number of wireless phones in use today capable of sending andreceiving SMS messages. The email device 530 provides a convenientalways on device whereby family members can sent short messages to eachother. For example, one spouse can leave a message for another spousebefore leaving work. The functions of the email device may be combinedwith the functions of another device, such as a keypad, toadvantageously form an integrated device.

[0174] Another example embodiment of a gateway 300 is a WiFi gateway520. As an alternative to using a USB gateway 510, the security network400 also supports a WiFi gateway 520. WiFi, also known as 802.11b, isbecoming a more prevalent form of networking computers. Recently, Intelmade available a new chip called Centrino by which many new computerswill automatically come equipped with WiFi support. Therefore, ratherthan using a USB gateway 510 that connects to a port on the computer450, a gateway 300 may include a WiFi module 313. The WiFi gateway 520can provide either local access from a local PC 450 (assuming that thelocal PC supports WiFi) to the security network 400, or alternately fromthe security network 400 to a public WiFi network 404. It is expectedthat in the near future, some neighborhoods will be wired with publicWiFi networks 404. These public WiFi networks 404 will provide anotheralternative access means to the internet from homes (in addition tocable modems 440 and DSL 441, for example). There may be users,therefore, that may prefer the security network 400 to provide alertsthrough this network rather than a PSTN 403 or CMRS 402 network. In theevent these public WiFi networks 404 become prevalent, then the securitynetwork 400 can offer the email access described above through thesenetworks as well. The WiFi gateway 520 primarily acts as a protocolconverter between the chosen modulation and protocol used within thesecurity network 400 and the 802.11b standard. In addition to theprotocol conversion, the WiFi gateway 520 also provides a software basedsecurity barrier similar to a firewall to prevent unauthorized access tothe security network 400.

[0175] Any base unit 200 may also include a camera 213. A typical typeof camera 213 may be a miniature camera of the type commonly availablein mobile phones and other consumer electronics. Low cost miniaturecameras are widely available for PC and wireless phone use, and formats(i.e. JPEG) for transmitting pictures taken by these miniature camerasare also widely known. By recording sequential images taken over a shortperiod of time, a time lapse record may be created. Through one or moreof the gateways 300, the security network 400 can access externalnetworks as well as be accessed through these same networks. Some usersmay find it useful to be able to visually or audibly monitor their homeor building remotely. Therefore, the security network 400 also supportsbase units 200 including cameras 213 and/or audio transducers 210 thatenable a user to remotely see and/or hear what is occurring in a home orbuilding. Each of the base units 200 can be individually addressed sinceeach is typically provided with a unique identity. When a securitynetwork 400 causes an alert, an emergency response agency 460 or anauthorized user can be contacted. In addition to reporting the alert, aswell as the device (i.e. identity of the transponder 100) causing thealert, the security network 400 can be configured to provide picturesand/or audio clips of the activity occurring within the security network400. Base units 200 with cameras 213 and/or audio transducers 210 willbe particularly useful in communities in which the emergency responseagency 460 requires confirmation of intrusion prior to dispatchingpolice.

[0176] There are multiple uses for the audio 210 and camera 213 supportin the security network 400 in addition to alarm verification by anemergency response agency 460. A caregiver can check in on the status ofan elderly person living alone using the audio and/or cameracapabilities of the security network 400. A family on a trip can checkin on the activities of a pet left at home. The owner of a vacation homecan periodically check in on the property during the winter months whenthe vacation home is otherwise unoccupied.

[0177] Certain base units 200 may be configured with additional memory211 for the purpose of storing pictures and/or audio files. By combiningwithin a security network 400 the audio 210 and/or camera 213 capabilitywith a USB gateway 300 and a local PC a user can store picture and audiofiles on the PC to provide a continuous record of activities in thehome. As an alternative to storing pictures on a local PC, a base unit200 can be provided with a large enough memory 211 to contain a filesystem wherein the file system stores pictures periodically taken by oneor more cameras in the security network 400. One way in which the memoryof a base unit 200 can be expanded is through the use of well-knownflash memory. For example, flash memory modules are available in avariety of pre-packaged formats such as PCMCIA, Compact Flash, or USB,so a base unit 200 can be implemented to accept modules in these formatsformat. The pictures and/or audio files in the file system can beaccessed later to retrieve pictures taken at particular times. Thesefiles can be accessed in a number of ways. If the memory 211 iscontained in a removable flash memory module, the module can be removedand inserted into another device such as a PC that can read the files.Alternately, the files in the memory 211 can be accessed through agateway 300. For example, a local PC can use a USB gateway 510 or WiFigateway 520 or an emergency response agency can use a telephone,wireless, or Ethernet based connection.

[0178] One advantageous base unit 200 in which a camera 213 can beincluded is a base unit 200 built into the physical form of a smokedetector 590 or a smoke detector collar 591 as shown in FIG. 15. Sincesmoke detectors are generally mounted on ceilings, the inclusion ofcamera 213 capability into a ceiling mounted base unit 200 built intothe physical form of a smoke detector 590 or smoke detector collar 591will provide the camera 213 with a wide angle of view with little likelyviewing obstruction. A base unit 200 built into the physical form of asmoke detector 590 can include smoke, fire, or CO detection capability212. The detection technology for smoke, fire, and/or CO is widely knownand available. A base unit 200 built into the physical form of a smokedetector collar 591 would likely not require smoke, fire, or COdetection 212 capability since the state of the attached smoke, fire, orCO can be detected by the base unit 200.

[0179] The inventive security network 400 does not require all smokedetectors 590 installed in a home to include a base unit 200 as definedin this specification. Certain manufacturers, such as a Firex forexample, already provide families of low cost smoke detectors that havea wired communications capability; that is, if one smoke detectordetects smoke and causes an audible alert, all smoke detectors that arewired to the detecting smoke detector also cause an audible alert. Usingthe present invention, one of the example Firex smoke detectors can bereplaced with a base unit 200 of the inventive security network 400, andif any of the Firex family of smoke detectors causes an alert and sendsa communications via the standard Firex wired communications, the baseunit 200 of the inventive security network 400 will receive the samecommunications as all Firex smoke detectors on the same circuit, and theinventive security network 400 can cause its own alert using its ownaudible capability and/or any gateway 300 devices 300 installed in theinventive security network 400. This ability to convert the wiredcommunications from an existing example Firex network of smoke detectorsinto an appropriate communications within the inventive security network400 obviates the need for a user to replace all of the smoke detectorsin a home when installing an inventive security network 400. While thisexample has been given using smoke detectors, it is understood that thisexample is extensible to fire detectors, carbon monoxide (CO) detectors,and other similar detection devices typically used in residential andcommercial buildings.

[0180] If the designer does not wish to design a base unit 200 includingsmoke/fire/CO detect capability 212, then the designer can place thebase unit 200 functionality into a smoke detector collar 591 that itplaced between an example smoke/fire/CO detector 590 and the mountingplate 592 attached to the ceiling 704. An AC powered smoke detectorusually requires that an electrical box be installed into the ceiling.The mounting plate 592 is attached to the electrical box in the ceilingand a connector protrudes from the electrical box. The smoke/fire/COdetector is then typically connected to the connector, and then snappedonto the mounting plate 592. Under the present invention, a smokedetector collar 591 can be placed between the mounting plate 592 and thesmoke/fire/CO detector 590. The smoke detector collar 591 can providethe physical volume to contain the base unit 200 functionality as wellas intercept the AC power and the communications wire that are containedin the connector protruding from the electrical box. By intercepting anddetecting the state of the communications wire, the base unit 200 candetect any changes in state, such as the signaling of an alert. Ratherthan intercepting the communications wire, or in the case of a sensorthat does not include a separate communications wire, the base unit 200can also sense the audio signal typically put out by an examplesmoke/fire/CO detector 590. These audio signals are generally designedto generate audio power of approximately 85 dB at 10 feet in variouspredetermined and distinctive patterns. The base unit 200 can include anappropriate audio transducer 210 that can sense the presence or absenceof the volume and/or distinctive pattern of the audio output by thesmoke/fire/CO detector 590. In any of the example cases, when the baseunit 200 detects an alert state being signaled by an examplesmoke/fire/CO detector 590, the base unit 200 can send a communicationsto the master controller 251 in the security network 400. The securitynetwork 400 can then send an alert to an emergency response agency ortake any other predetermined action configured in the security network400 by the end user.

[0181] Note that while smoke detectors and Firex have been used asexamples, other types of sensors and other brands/manufacturers can besubstituted into this specification without detracting from theinventive nature. It is also not required that full base unit 200functionality be placed into the smoke/fire/CO detector 590 or smokedetector collar 591. If no camera 213 or audio 210 capability isdesired, then a transponder 100 can be implemented in the smoke/fire/COdetector 590 or smoke detector collar 591 instead of a base unit 200. InFIG. 15, both the base unit 200 and transponder 100 are shown withdashed lines to show the optional choices that can be made.

[0182] The base unit 200 can include several options that increase boththe level of security and functionality in the inventive securitynetwork 400. One option enhances the base unit 200 to include anacoustic transducer 210 capable of receiving and/or emitting sound wavesthat enables a glass breakage detection capability in the base unit 200.Glass breakage sensors have been widely available for years for bothwired and wireless prior art security networks 400. However, they areavailable only as standalone sensors typically selling for $30 to $50 ormore. Of course, in a hardwired system, there is also the additionallabor cost of installing separate wires from the alarm panel to thesensor. The cost of the sensors generally limits their use to just a fewrooms in a house or other building. The cost is due in part to the needfor circuits and processors dedicated to just analyzing the sound waves.

[0183] Since the base unit 200 already contains a power supply 207 and aprocessor 203 the only incremental cost of adding the glass breakagedetection capability is the addition of the acoustic transducer 210 andthe software to analyze sound patterns for any of the distinctivepatterns of breaking glass. With the addition of this option, glassbreakage detection can be available in every room in which a base unit200 has been installed.

[0184] Glass breakage detection is performed by analyzing received soundwaves to look for certain sound patterns distinct in the breaking ofglass. These include certain high frequency sounds that occur during theimpact and breaking of the glass and low frequencies that occur as aresult of the glass flexing from the impact. The sound wave analysis canbe performed by any number of widely known signal processing techniquesthat permit the filtering of received signals and determination ofsignal peaks at various frequencies over time.

[0185] One advantage of the present invention over prior art standaloneglass breakage sensors is the ability to adjust parameters in the field.Because glass breakage sensors largely rely on the receipt of audiofrequencies, they are susceptible to false alarms from anything thatgenerates sounds at the right combination of audio frequencies.Therefore, there is sometimes a requirement that each glass breakagesensor be adjusted after installation to minimize the possibility offalse alarms. In some cases, no adjustment is possible in prior artglass breakage detection devices because algorithms are permanentlystored in firmware at the time of manufacture. Because the glassbreakage detection of the present invention is performed by the baseunits, which include or are in communication with a controller function250, the controller function 250 can alter or adjust parameters used bythe base unit 200 in glass breakage detection. For example, thecontroller function 250 can contain tables of parameters, each of whichapplies to different building construction materials or window types.The user can select the appropriate table entry during systemconfiguration, or select another table entry later after experience hasbeen gained with the installed security network 400. Furthermore, thecontroller function 250 can contact an appropriate database via agateway 300 that is, for example, managed by the manufacturer of thesecurity network 400 to obtain updated parameters. There is, therefore,significant advantage to this implementation of glass breakagedetection, both in the cost of device manufacture and in the ability tomake adjustments to the processing algorithms used to analyze the soundwaves.

[0186] In a manner similar to glass breakage detection above, thereceived sound waves can be analyzed to look for certain (usually veryhigh decibel) sound patterns distinct in alerting smoke detectors, firealarms, carbon monoxide detectors, and similar local alerting devices.When one or more base units 200 detect the distinct sound patterns fromany of these local alerting devices, the controller function 250 cansend an appropriate message via a gateway 300 to an emergency responseagency 460.

[0187] The addition of the acoustic transducer 210, with both soundinput and output capability, to the base unit 200 for the glass breakageoption also allows the base unit 200 to be used by an emergency responseagency 460 as a distributed microphone to listen into the activities ofan intruder. Rather than analyzing the sound waves, the sound waves canbe digitized and send to the gateway 300, and then by the gateway 300 tothe emergency response agency 460. After the gateway 300 has sent analert message to the emergency response agency 460, the audio transducercan be available for use in an audio link. This two-way audio capabilitythrough the acoustic transducer 210 can be useful for more than justlistening by an emergency response agency 460. Parents who are not homecan listen into the activities of children who might be home. Similarly,a caregiver can use the two-way audio to communicate with an elderlyperson who might be living alone.

[0188] In a similar manner, the base unit 200 can contain optionalalgorithms for the sensing of motion in the room. Like glass breakagesensors, prior art motion sensors are widely available as standalonedevices. Prior art motion sensors suffer from the same disadvantagescited for standalone glass breakage sensors, that is they are typicallystandalone devices requiring dedicated processors, circuits, andmicrowave generators. However, the base unit 200 already contains all ofhardware components necessary for generating and receiving the radiowave frequencies commonly using in detecting motion; therefore the baseunit 200 only requires the addition of algorithms to process the signalsfor motion in addition to performing its reading of the transponders.Different algorithms are available for motion detection at microwavefrequencies. One such algorithm is Doppler analysis. It is a well knownphysical phenomenon that objects moving with respect to a transmittercause a reflection with a shift in the frequency of the reflected wave.While the shift is not large relative to the carrier frequency, it iseasily detectable. Therefore, the base unit 200 can perform as a Dopplerradar by the rapid sending and receiving of radio pulses, with thesubsequent measurement of the reflected pulse relative to thetransmitted pulse. People and animals walking at normal speeds willtypically generate Doppler shifts of 5 Hz to 50 Hz, depending on thespeed and direction of movement relative to the base unit 200 antenna206. The implementation of this algorithm to detect the Doppler shiftcan be, at the discretion of the designer, be implemented with adetection circuit or by performing signal analysis using the processorof the base unit 200. In either case, the object of the implementationis to discriminate any change in frequency of the return signal relativeto the transmitted signal for the purpose of discerning a Doppler shift.The base unit 200 is capable of altering its transmitted power to varythe detection range of this motion detection function.

[0189] These motion detection functions can occur simultaneously withthe reading of passive transponders 150. Because the passivetransponders 150 are fixed relative to the base units, no unintendedshift in frequency will occur in the reflected signal. Therefore, foreach transmitted burst to a passive transponder 150, the base unit 200can analyze the return signal for both receipt of data from the passivetransponder 150 as well as unintended shifts in frequency indicating thepotential presence of a person or animal in motion.

[0190] By combining the above functions, the base unit 200 in oneexample single integrated package may be capable of (i) communicatingwith other base units 200 using high power RF communications, (ii)communicating with transponders using low power RF and backscatterwireless communications, (iii) detecting motion via Doppler analysis atmicrowave frequencies, (iv) detecting glass breakage and/or high decibelalerts via sound wave analysis of acoustic waves received via an audiotransducer 210, and (v) providing a two-way audio link to an emergencyresponse agency 460 via an audio transducer 210 and via a gateway 300.This base unit 200 achieves significant cost savings versus prior artsecurity networks 400 through the avoidance of new wire installation andthe sharing of communicating and processing circuitry among the multiplefunctions. Furthermore, because the base units 200 are under the controlof a single master controller 251, the performance of these functionscan be coordinated to minimize interference, and provide spatialdiversity and redundant confirmation of received signals.

[0191] A microwave frequency motion detector implemented in the baseunit 200 is only a single detection technology. Historically, singlemotion detection technologies, whether microwave, ultrasonic, or passiveinfrared, all suffer false positive indications. For example, a curtainbeing blown by a heating vent can occasionally be detected by a Doppleranalysis motion detector. Therefore, dual technology motion detectorsare sometimes used to increase reliability—for example by combiningmicrowave Doppler with passive infrared so that motion by a warm body isrequired to trigger an alert. The inventive security network 400implements a novel technique to implement dual technology motion sensingin a room without the requirement that both technologies be implementedinto a single package.

[0192] Existing dual technology sensors implement both technologies intoa single sensors because the sensors are only capable or reporting a“motion” or “no motion” condition to the alarm panel. This is fortunate,because present prior art alarm panels are only capable of receiving a“contact closed” or “contact open” indication. Therefore, all of theresponsibility for identifying motion must exist within the singlesensor package. The inventive controller function 250 can receivecommunications with a passive infrared sensor 570 mounted separatelyfrom the base unit 200. Therefore, if in a single room, the base unit200 is detecting motion via microwave Doppler analysis and a passiveinfrared sensor 570 is detecting the presence of a warm body 710 asshown in FIG. 6, the master controller 251 can interpret the combinationof both of these indications in a single room as the likely presence ofa person.

[0193] One embodiment of this passive infrared sensor 570 is in the formof a light switch 730 with cover 731 as shown in FIG. 14A. Most majorrooms have at least one existing light switch 730, typically mounted atan average height of 55″ above the floor. This mounting height is abovethe majority of furniture in a room, thereby providing a generally clearview of the room. Passive infrared sensors have previously been combinedwith light switches 730 so as to automatically turn on the light whenpeople are in room. More importantly, these sensor/switches turn off thelights when everyone has left, thereby saving electricity that wouldotherwise be wasted by lighting an unoccupied room. Because the primarypurpose of these existing devices is to provide local switching, thedevices cannot communicate with central controllers such as existingalarm panels.

[0194] The passive infrared sensor 570 that operates with the inventivesecurity network 400 includes any of high power RF communications, lowpower RF communications, or modulated backscatter communications permitthe said passive infrared sensor 570 to communicate with one or morecontroller functions 250 in base units 200 and be under control of themaster controller 251. The passive infrared sensor 570 can be thereforebe combined with a transponder 100 or included in a base unit 200. Atthe time of system installation, the master controller 251 is configuredby the user thereby identifying the rooms in which the base units 200are located and the rooms in which the passive infrared sensors 570 arelocated. The master controller 251 can then associate each passiveinfrared sensor 570 with one or more base units 200 containing microwaveDoppler algorithms. The master controller 251 can then require thesimultaneous or near simultaneous detection of motion and a warm body,such as a person 710, before interpreting the indications as a probableperson in the room.

[0195] Because each of the base units 200 and passive infrared sensors570 are under control of the master controller 251, portions of thecircuitry in these devices can be shut down and placed into a sleep modeduring normal occupation of the building. Since prior art motion sensorsare essentially standalone devices, they are always on and are alwaysreporting a “motion” or “no motion” condition to the alarm panel.Obviously, if the alarm panel has been placed into a disarmed statebecause, for example, the building is being normally occupied, thenthese “motion” or “no motion” conditions are simply ignored by the alarmpanel. But the sensors continue to use power, which although the amountmay be small, it is still a waste of AC or battery power. Furthermore,it is well known in the study of reliability of electronic componentsthat “power on” states generate heat in electronic components, and it isheat that contributes to component aging and possible eventual failure.

[0196] The present security network 400 can selectively shut down or atleast slow down the rate of the radiation from the base units 200 whenthe security network 400 is in a disarmed mode, or if the homeowner orbuilding owner wants the security network 400 to operate in a perimeteronly mode without regard to the detection of motion. By shutting downthe radiation and transmissions used for motion detection, the securitynetwork 400 is conserving power, extending the potential life of thecomponents, and reducing the possibility of interference between thebase unit 200 and other products that may be operating in the sameunlicensed band. This is advantageous because, for example, while peopleare occupying the building they may be using cordless telephones (orwireless LANs, etc.) and want to avoid possible interference from thebase unit 200. Conversely, when the security network 400 is armed, thereare likely no people in the building, and therefore no use of cordlesstelephones, and the base units 200 can operate with reduced risk ofinterference from the transmissions from said cordless telephones.

[0197] In general, a passive transponder 150 has two primary functions:manage its wireless communications and monitor a state change of anyattached multi-state device. The following description considers theexample of a passive transponder 150 used for monitoring intrusionsthrough a window or door opening. The description can be expanded toinclude any number of additional examples, however.

[0198] A passive transponder 150, shown in FIG. 11, used with theinventive security network 400 achieves its advantage over wirelesstransmitters of prior art security systems through its low cost design.The passive transponder 150 contains no active radiation circuitry, andtherefore the design can be limited to low frequency, low powercircuitry. A passive transponder 150 can be designed with or without abattery, however the design choice will have an impact on thecorresponding base unit 200 design. If a passive transponder 150 isdesigned without a battery, the base unit 200 will be required totransmit at a higher power level in order to generate a high enoughelectric field to power the passive transponder 150 circuits. The FCCrule sections cited herein permit the transmission of sufficient powerto generate the necessary electric fields, but more expensive circuitryis required in the base unit 200 to achieve the necessary power levels.If a passive transponder 150 is designed with a battery, the base unit200 can be designed using lower cost circuitry since the transmittedpower will be necessary only for the backscatter modulation to workproperly. The example considers cases of both with or without a batterycontained in the passive transponder 150.

[0199] The passive transponder 150 typically engages in one or more ofthe following types of communications:

[0200] receive parameter information

[0201] receive status requests

[0202] send status (which may include the state of an attachedmulti-state device)

[0203] send state change information about an attached multi-statedevice

[0204] Because the passive transponder 150 uses backscatter modulationfor sending communications to a base unit, the passive transponder 150can never initiate a communications as can a base unit 200. The passivetransponder 150 can only respond to a communications from a base unit200. There are two possible methods by which a base unit 200 cancommunicate with a passive transponder: (i) listen first, then talk; or(ii) talk first, then listen.

[0205] In order to listen, the base unit 200 transmits a signal that thepassive transponder 150 can backscatter modulate. The signal provided bythe base unit 200 may be modulated or may simply be continuous wave. Thecommunications from the passive transponder 150 will include theoriginal signal along with the modulation from the passive transponder150. The base unit 200 will typically subtract the provided signal fromthe communications returned from the passive transponder 150, therebyleaving only the modulation from the passive transponder 150.

[0206] When listening first, the base unit 200 first transmits itssignal that enables communications from the passive transponders 150.One or more passive transponders 150 may elect to backscatter modulatethe signal, thereby attempting to send communications to the base unit200. After receiving communications from the one or more passivetransponders 150, the base unit 200 may then talk to the passivetransponders 150 if the base unit 200 has a communications to send. Inorder to talk, the base unit 200 transmits a message typically using oneof the modulation schemes discussed herein. The transmitted message mayinclude a reply to a communications from the one or more passivetransponders 150, or may include a command, parameters, or overheadmessage. One type of reply is a confirmation of the communicationsreceived from the passive transponder 150. Another type of reply may bethat the communications from the passive transponder 150 failed to bereceived.

[0207] When talking first, the base unit 200 first transmits itsmessage, which then may be followed by the transmission of its signalthat enables communications from the passive transponders 150. Bytalking first, the base unit 200 may direct a particular passivetransponder 150 to communicate in return, or enable any passivetransponder 150 with data to send to communicate in return.

[0208] Whether or not the passive transponder 150 contains a battery, itis preferred that the passive transponder 150 conserve power byoperating in a periodic cycle. During a portion of the periodic cycle,it is preferred that the passive transponder 150 place some or all ofits circuits in a low power or zero power state. For example, if thepassive transponder 150 is designed using CMOS based circuitry, anyclock used to drive the circuitry can be stopped since CMOS circuits usemost of their power during clock or signal transitions. During otherportions of the periodic cycle, sufficient circuitry may be enabled suchthat the passive transponder 150 can send communications to or receivecommunications from the base unit 200. It is not required that allpassive transponders 150 within a single security network 400 use thesame periodic cycle. Some may have longer cycles than others. Ifnecessary, the controller function may maintain a table listing eachmanaged passive transponder 150 and its corresponding periodic cycle.

[0209] The master controller 251 in a security network 400 willtypically establish certain operating parameters, which can vary frominstallation to installation. One of the parameters may be the periodiccycle on which the passive transponders 150 are to operate. Theseparameters may vary with the number of active and passive transponders150 installed in a system, as well as with the present state of thesystem. For example, if a security network 400 is presently in thedisarmed state, the master controller 251 may lengthen the periodiccycle which will cause less frequent communications and conserve morepower in the transponders. If the security network 400 is presentlyarmed, the periodic cycle may be shortened to enable more frequentcommunications to ensure the integrity of the system.

[0210] Other parameters that the master controller 251 may send to apassive transponder 150 may include identity information about thesecurity network 400, identity information for each transponder 100, andkeys that the passive transponder 150 may use for encryption orauthentication in its communication with a base unit 200. In geographicareas where many security networks 400 may be simultaneously operating,the stored identity information may be useful in maintaining the desiredassociations between each security network 400 and its base units 200,transponders 100, and other active and passive transponders 150.

[0211] Many forms of the passive transponder 150 will be used to monitorand report upon the state of an attached sensor. For example, one formof the passive transponder 150 may monitor the open/closed state of awindow or door via an intrusion sensor. An intrusion sensor 600 willtypically be a two state device; however the passive transponder 150 mayalso support multi-state devices. The passive transponder 150 willtypically report its status and the status of an attached sensor 600 or620 periodically. This periodic status message serves as a “heartbeat”by which the base unit 200 can supervise each of the installedtransponders. The periodicity of the this status message may be set asone of the parameters sent by the master controller 251. Like theperiodic cycle discussed herein, the periodicity of the status messagesmay vary with the present state of the system.

[0212] There are two other times when the passive transponder 150 mayreport its status: (i) in response to a status request message receivedfrom a base unit 200, or (ii) if the passive transponder 150 detects achange in the state of an attached sensor 600 or 620. If the passivetransponder 150 does detect a change in the state of an attached sensor,the passive transponder 150 may interrupt the communications that may beoccurring between a base unit 200 and a second passive transponder 150or the passive transponder 150 may wait for next available listen signalfrom a base unit 200.

[0213] Because passive transponders 150 cannot initiate communications,there may be times when there is a time lag between the time that thepassive transponder 150 detects a change in the state of an attachedsensor or device and the time that the passive transponder 150communicates with a base unit 200. The time lag will typically be basedupon the operating parameters of the security network 400, and may onlybe one or a few seconds. However, the existence of any time lag createsthe possibility that the state may change more than once during the timelag. For example, an intruder may open and close a window or door injust a few seconds. Therefore, the passive transponder 150 may include alatch that records any change in state of an attached sensor or device,however brief the change of state may have been. The latch may beimplemented using logic gates, such as a flip flop, or in the statemachine or processor of the passive transponder 150. The latch typicallyhold the state change until at least time that the passive transponder150 communicates the state change to a base unit 200. The passivetransponder 150 may either maintain the latched state change until thestate change has been communicated or may maintain the latched statechange until a base unit 200 sends a command that clears the latch.

[0214] One form of passive transponder 150 may typically be providedwith an adhesive backing to enable easy attachment to the frame of anopening such as, for example, a window 702 frame or door 701 frame.Passive transponder 150 designs based upon modulated backscatter arewidely known and the details of transponder 100 design are wellunderstood by those skilled in the art. The passive transponder 150functions may be implemented within a single chipset or may beimplemented as separate components in a circuit on a printed circuitsubstrate. The passive transponder 150 receives and interprets commandsfrom the base unit 200 by typically including circuits for clockextraction 103 and data modulation 104. The manner of implementing clockextraction 103 and data modulation 104 will depend upon the type ofmodulation used for wireless communications from the base unit 200 tothe passive transponder 150. For example, if on-off keying is used, thedata modulation 104 circuit can be as simple as a diode. Morecomplicated designs have been shown in circuits such as those disclosedin U.S. Pat. Nos. 6,384,648 and 6,549,064. The microcontroller 106 cansend data and status back to the base unit 200 by typically using amodulator 102 to control the impedance of the antenna 110. Thismodulator 102 may take the form of a single diode or FET or may be morecomplicated such as the patent examples cited herein. The impedancecontrol alternately causes the absorption or reflection of the RF energytransmitted by the base unit 200 thereby forming the response wirelesscommunications. The microcontroller 106 may be implemented as a statemachine designed into a programmable logic array, or may be a processorcontrolled via firmware. Each of these embodiments are designer choicesthat do not affect the novelty of the invention.

[0215] Similarly, the energy store 108 has been shown internal to thepassive transponder 150; however, part or all of the energy store 108may be located off-board of the passive transponder 150 in order toprovide more physical space for a larger energy store 108. If the energystore 108 is a battery with sufficient capacity, it is possible that thepassive transponder 150 does not rely upon the power radiated from thebase unit 200 to periodically charge the energy store 108. If, however,the energy store 108 is a capacitor or low capacity battery, then thepassive transponder 150 may include energy management circuits such asan overvoltage clamp 101 for protection, a rectifier 105 and regulator107 to produce proper voltages for use by the charge pump 109 incharging the energy store 108 and powering the microcontroller 106.

[0216] Low cost chipsets and related components are available from alarge number of manufacturers. In the present invention, the base unit200 to passive transponder 150 radio link budget can be designed tooperate at an approximate range of up to 30 meters. In a typicalinstallation, each opening will have a passive transponder 150installed. The ratio of passive transponders 150 to each base unit 200will typically be 3 to 8 in an average residential home, although thetechnology of the present invention has no practical limit on thisratio. The choice of addressing range is a designer's choice largelybased on the desire to limit the transmission of wasted bits. In orderto increase the security of the transmitted bits, the passivetransponders 150 can include an encryption algorithm. The tradeoff isthat this will increase the number of transmitted bits in each message.The key to be used for encryption can be exchanged during enrollment.

[0217] Passive transponders 150 are typically based upon a modulatedbackscatter design. Each passive transponder 150 in a room can absorbpower radiated from one or more base units 200 when the said passivetransponder 150 is being addressed, as well as when other passivetransponders 150 are being addressed. In addition, the base units 200can radiate power for the purpose of providing energy for absorption bythe passive transponders 150 even when the base unit 200 is notinterrogating any passive transponders 150. Therefore, unlike most RFIDapplications in which the passive transponders 150 or tags are mobileand in the read zone of a prior art base unit 200 briefly, the passivetransponders 150 of the present invention are fixed relative to the baseunits 200 and therefore always in the read zone of at least one baseunit 200. Therefore, the said passive transponders 150 have extremelylong periods of time in which to absorb, integrate, and storetransmitted energy.

[0218] In a typical day to day operation, the base unit 200 is makingperiodic transmissions. The master controller 251 will typicallysequence the transmissions from the base units 200 so as to preventinterference between the transmissions of any two base units. The mastercontroller 251 will also control the rates and transmission lengths,depending upon various states of the system. For example, if thesecurity network 400 is in a disarmed state during normal occupancyhours, the master controller 251 may use a lower rate of transmissionssince little or no monitoring may be required. When the security network400 is in an armed state, the rate of transmissions may be increased soas to increase the rate of wireless communications between the baseunits 200 and the various sensors. The increased rate of wirelesscommunications will reduce the latency from any attempted intrusion tothe detection of the attempted intrusion. The purpose of the varioustransmissions will generally fall into several categories including:power transfer without information content, direct addressing of aparticular passive transponder 150, addressing to a predetermined groupof passive transponders 150, general addressing to all passivetransponders 150 within the read range, and radiation for motiondetection.

[0219] A passive transponder 150 can typically only send a responsewireless communication in reply to a transmission from a base unit 200.Furthermore, the passive transponder 150 will typically only send aresponse wireless communication if the passive transponder 150 hasinformation that it desires to communicate. Therefore, if the base unit200 has made a globally addressed wireless communication to all passivetransponders 150 asking if any passive transponder 150 has a change instatus, a passive transponder 150 is not required to respond if in factit has no change in status to report. This communications architecturereduces the use of resources on multiple levels. On the other hand, ifan intrusion sensor 600 detects a probable intrusion attempt, it isdesirable to reduce the latency required to report the probableintrusion attempt. Therefore, the communications architecture alsoincludes a mechanism whereby a passive transponder 150 can cause aninterrupt of the otherwise periodic transmissions of any category inorder to request a time in which the said passive transponder 150 canprovide a response wireless communications with the details of theprobable intrusion attempt. The interrupt might be, for example, anextended change of state of the antenna (i.e. from terminate to shorted)or a sequence of bits that otherwise does not occur in normalcommunications messages (i.e. 01010101). An example sequence may be: (a)the base unit 200 may be transmitting power without information content,(b) a first passive transponder 150 causes an interrupt, (c) the baseunit 200 detects the interrupt and sends a globally addressed wirelesscommunications, (d) the said first passive transponder 150 sends itsresponse wireless communications. This example sequence may also operatesimilarly even if in step (a) the base unit 200 had been addressing asecond passive transponder; steps (b) through (d) may otherwise remainthe same.

[0220] If the passive transponder 150 does not contain an energy store108 with sufficient capacity, energy to power the passive transponder150 is derived from the buildup of electrostatic charge across theantenna elements 110 of the passive transponder 150. As the distanceincreases between the base unit 200 and the passive transponder 150, thepotential voltage that can develop across the antenna elements declines.For example, under 47 CFR 15.245 the base unit 200 can transmit up to7.5 W power. At a distance of 10 m, this transmitted power generates afield of 1500 mV/m and at a distance of 30 m, the field declines to 500mV/m.

[0221] The passive transponder 150 may therefore include a charge pump109 in which to incrementally add the voltages developed across severalcapacitors together to produce higher voltages necessary to charge theon-board and/or off-board energy store 108 and/or power the variouscircuits contained within the passive transponder 150. Charge pumpcircuits for boosting voltage are well understood by those skilled inthe art. For example, U.S. Pat. Nos. 5,300,875 and 6,275,681 containdescriptions of some examples.

[0222] One embodiment of the passive transponder 150 can contain abattery 111, such as a button battery (most familiar use is as a watchbattery) or a thin film battery. Batteries of these shapes can be basedupon various lithium compounds that provide very long life. Therefore,rather than relying solely on a limited energy store 108 such as acapacitor, the passive transponder 150 can be assured of always havingsufficient energy through a longer life battery 111 component. If orderto preserve charge in the battery 111, the microcontroller 106 of thepassive transponder 150 can place some of the circuits in the passivetransponder 150 into temporary sleep mode during periods of inactivity.The use of the battery 111 in the passive transponder 150 typicallydoesn't change the use the passive modulated backscatter techniques asthe communications means. Rather, the battery 111 is typically used toenhance and assist in the powering of the various circuits in thepassive transponder 150.

[0223] One means by which the passive transponder 150 replies to thebase unit 200 uses a modulation such as On-Off Keyed (OOK) amplitudemodulation. The OOK operates by receiving a carrier wave from the baseunit 200 at a center frequency selected by the base unit, or a mastercontroller 251 directing the base unit, and modulating marking (i.e. a“one”) and spacing (i.e. a “zero”) bits onto the carrier wave at shiftedfrequencies. The marking and spacing bits obviously use two differentshifted frequencies, and ideally the shifted frequencies are selected sothat neither creates harmonics that can confuse the interpretation ofthe marking and spacing bits. In this example, the OOK is not purely onand off, but rather two different frequency shifts nominally interpretedin the same manner as a pure on-off might normally be interpreted. Thepurpose is to actively send bits rather that using the absence ofmodulation to represent a bit. The use of OOK, and in particularamplified OOK, makes the detection and interpretation of the returnsignal at the base unit 200 simpler than with some other modulationschemes.

[0224] In addition to the charge pump 109 for recharging the battery111, the passive transponder 150 may contain circuits for monitoring thecharged state of the battery 111. This state can range from fullycharged to discharged in various discrete steps, and can be reportedfrom the passive transponder 150 to the base unit 200. For example, ifthe battery 111 is sufficiently charged, the passive transponder 150 cansignal the base unit 200 using one or more bits in a communicationsmessage. Likewise, if the battery 111 is less than fully charged, thepassive transponder 150 can signal the base unit 200 using one or morebits in a wireless communications message. Using the receipt of thesemessages regarding the state of the battery 111, if present, in eachpassive transponder 150, the base unit 200 can take actions to continuewith the transmission of radiated power, increase the amount of powerradiated (obviously while remaining within prescribed FCC limits), oreven suspend the transmission of radiated power if no passivetransponder 150 requires power for battery charging. By suspendingunnecessary transmissions, the base unit 200 can conserve wasted powerand reduce the likelihood of causing unwanted interference.

[0225] One form of the transponder 100, excluding those designed becarried by a person or animal, is typically connected to at least oneintrusion sensor 600. From a packaging standpoint, the present inventionalso includes the ability to combine the intrusion sensors 600 and thetransponder 100 into a single package, although this is not arequirement of the invention.

[0226] The intrusion sensor 600 is typically used to detect the passage,or attempted passage, of an intruder through an opening in a building,such as window 702 or door 701. Thus the intrusion sensor 600 is capableof being in at least two states, indicating the status of the window 702or door 701 such as “open” or “closed”. Intrusion sensors 600 can alsobe designed under this invention to report more that two states. Forexample, an intrusion sensor 600 may have 4 states, corresponding towindow 702 “closed”, window 702 “open 2 inches”, window 702 “openhalfway”, and window 702 “open fully”.

[0227] In a typical form, the intrusion sensor 600 may simply detect themovement of a portion of a window 702 or door 701 in order to determineits current state. This may be accomplished, for example, by the use ofone or more miniature magnets, which may be based upon rare earthmetals, on the movable portion of the window 702 or door 701, and theuse of one or more magnetically actuated miniature reed switches onvarious fixed portions of the window 702 or door 701 frame. Other formsare also possible. For example, pressure sensitive contacts may be usedwhereby the movement of the window 702 or door 701 causes or relievesthe pressure on the contact, changing its state. The pressure sensitivecontact may be mechanical or electro-mechanical such as a MEMS device.Alternately various types of Hall effect sensors may also be used toconstruct a multi-state intrusion sensor 600.

[0228] In any of these cases, the input/output leads of the intrusionsensor 600 are connected to, or incorporated into, the transponder 100such that the state of the intrusion sensor 600 can be determined by andthen transmitted by the transponder 100 in a message to the base unit200.

[0229] Because the transponder 100 is a powered device (without orwithout the battery 111, the transponder 100 can receive and storepower), and the base unit 200 makes radiated power available to anydevice within its read zone capable of receiving its power, other formsof intrusion sensor 600 design are also available. For example, theintrusion sensor 600 can itself be a circuit capable of limitedradiation reflection. Under normally closed circumstances, the closelocation of this intrusion sensor 600 to the transponder 100 and thesimultaneous reflection of RF energy can cause the generation ofharmonics detectable by the base unit 200. When the intrusion sensor 600is moved due to the opening of the window 702 or door 701, the gapbetween the intrusion sensor 600 and the transponder 100 will increase,thereby reducing or ceasing the generation of harmonics. Alternately,the intrusion sensor 600 can contain metal or magnetic components thatact to tune the antenna 110 or frequency generating components of thetransponder 100 through coupling between the antenna 110 and the metalcomponents, or the switching in/out of capacitors or inductors in thetuning circuit. When the intrusion sensor 600 is closely located next tothe transponder 100, one form of tuning is created and detected by thebase unit 200. When the intrusion sensor 600 is moved due to the openingof the window 702 or door 701, the gap between the intrusion sensor 600and the transponder 100 will increase, thereby creating a different formof tuning within the transponder 100 which can also be detected by thebase unit 200. The intrusion sensor 600 can also be an RF receiver,absorbing energy from the base unit, and building an electrostaticcharge upon a capacitor using a charge pump, for example. The increasingelectrostatic charge will create a electric field that is small, butdetectable by a circuit in the closely located transponder 100. Again,when the intrusion sensor 600 is moved, the gap between the intrusionsensor 600 and the transponder 100 will increase, causing thetransponder 100 to no longer detect the electric field created by theintrusion sensor 600.

[0230] Another form of intrusion sensor 600 may be implemented withlight emitting diode (LED) generators and detectors. Two forms ofLED-based intrusion sensor 600 are available. In the first form, shownin FIG. 25A, the LED generator 601 and detector 602 are incorporatedinto the fixed portion of the intrusion sensor 600 that is typicallymounted on the window 702 or door 701 frame. It is immaterial to thepresent invention whether a designer chooses to implement the LEDgenerator 601 and detector 602 as two separate components or a singlecomponent. Then a reflective material, typically in the form of a tape603 can be attached to the moving portion of the window 702 or door 701.If the LED detector 602 receives an expected reflection from the LEDgenerator 601, then no alarm condition is present. If the LED detector602 receives a different reflection (such as from the paint of thewindow rather than the installed reflector) or no reflection from theLED generator 601, then an intrusion is likely being attempted. Thereflective tape 603 can have an interference pattern 604 embedded intothe material such that the movement of the window 702 or door 701 causesthe interference pattern 604 to move past the LED generator 601 anddetector 602 that are incorporated into the fixed portion of theintrusion sensor 600. In this case, the movement itself signals that anintrusion is likely being attempted without waiting further for the LEDdetector 602 to receive a different reflection or no reflection from theLED generator 601. The speed of movement is not critical, as it is thedata encoded into the interference pattern 604 and not the data ratethat is important. The use of such an interference pattern 604 canprevent easy defeat of the LED-based intrusion sensor 600 by the simpleuse of tin foil, for example. A different interference pattern 604,incorporating a different code, can be used for each separate window 702or door 701, whereby the code is stored into the master controller 251and associated with each particular window 702 or door 701. This furtherprevents defeat of the LED-based intrusion sensor 600 by the use ofanother piece of reflective material containing any other interferencepattern 604. This use of the LED-based intrusion sensor 600 is madeparticularly attractive by its connection with a transponder 100containing a battery 111. The LED generator 601 and detector 602 will,of course, consume energy in their regular use. Since the battery 111 ofthe transponder 100 can be recharged as discussed elsewhere, thisLED-based intrusion sensor 600 receives the same benefit of long lifewithout changing batteries.

[0231] A second form of LED-based intrusion sensor 600 is alsoavailable. In this form, the LED generator 601 and LED detector 602 areseparated so as to provide a beam of light across an opening as shown inFIG. 25B. This beam of light will typically be invisible to the nakedeye such that an intruder cannot easily see the presence of the beam oflight. The LED detector 602 will typically be associated with theLED-based intrusion sensor 600, and the LED generator 601 will typicallybe located across the opening from the LED detector 602. In this form,the purpose of the LED-based intrusion sensor 600 is not to detect themovement of the window 702 or door 701, but rather to detect a breakageof the beam caused by the passage of the intruder through the beam. Thisform is particularly attractive if a user would like to leave a window702 open for air, but still have the window 702 protected in case anintruder attempts to enter through the window 353. As before, it wouldbe preferred to modulate the beam generated by the LED generator 601 soare to prevent easy defeat of the LED detector 602 by simply shining aseparate light source into the LED detector 602. Each LED generator 601can be provided with a unique code to use for modulation of the lightbeam, whereby the code is stored into the master controller 251 andassociated with each particular window 702 or door 701. The LEDgenerator 601 can be powered by a replaceable battery or can be attachedto a transponder 100 containing a battery 111 so that the LED generator601 is powered by the battery 111 of the transponder 100, and thebattery 111 is recharged as discussed elsewhere. In this latter case,the purpose of the transponder 100 associated with the LED generator 601would not be report intrusion, but rather only to act to absorb RFenergy provided by the base unit 200 and charge the battery 111.

[0232] In each of the cases, the transponder 100 is acting with aconnected or associated intrusion sensor 600 to provide an indication tothe base unit 200 that an intrusion has been detected. The indicationcan be in the form of message from the transponder 100 to the base unit,or in the form of a changed characteristic of the transmissions from thetransponder 100 such that the base unit 200 can detect the changes inthe characteristics of the said transmission. It is impossible to knowwhich form of intrusion sensor 600 will become most popular with usersof the inventive security network 400, and therefore the capability formultiple forms has been incorporated into the invention. Therefore, theinventive nature of the security network 400 and the embodimentsdisclosed herein is not limited to any single combination of intrusionsensor 600 technique and transponder 100.

[0233] In addition to the modulation scheme, the security network 400may include an RF access protocol that contains elements of variouslayers of the OSI communications reference model. This invention is notspecific to any chosen framing, networking, or related technique,however there are a number of characteristics of the RF access protocolthat are advantageous to the invention.

[0234] It is preferred that base units 200 belonging to a commonsecurity network 400 are organized into a common frequency plan. Eachbase unit 200 described herein is a wireless transmitter. For high powerRF communications, base units 200 are governed by 47 CFR 15.247, whichmay require each base unit 200 to periodically frequency hop. It ispreferred that the hopping sequences be organized in time and frequencysuch that no two base units 200 attempt to operate on the same frequencyat the same time. Even in an average home, a security network 400 of thepresent invention may typically include between 4 and 10 base units 200whose frequency management may be more complex than the few cordlessphones and/or a WiFi network that may also be collocated there. 47 CFR15.247 permits some forms of frequency coordination to minimizeinterference and collisions, and it is preferred that any base unit 200take advantage of those permissions.

[0235] Frequency coordination between the base units 200 contained inseparate but nearby security networks 400 may be required. Each securitynetwork 400 will typically be operating its own network with its ownfrequency plan, but in preferred implementations, the security networks400 detect and coordinate in both time and frequency. This mayaccomplished in the following example manner. The base units 200 in anyfirst security network 400 will typically have periods of time in whichno transmissions are required. Rather than idle, these base units 200may periodically scan the frequency band of interest to determine thepresence of other transmitters. Some of the other transmitters will becordless phones and WiFi wireless access points. The scanning base units200 can note the presence and frequency location of these other devices,especially the WiFi devices that typically maintain fixed frequencies.If the scanning base units 200 note that the same devices continue toconsistently occupy the same frequency locations, the first securitynetwork 400 may opt to avoid those frequency locations to avoidinterference. If the scanning base units 200 discover transmitters thatare base units 200 from a second security network 400, the firstsecurity network 400 can frequency coordinate with the second securitynetwork 400. Then, rather than avoiding certain frequency locations toavoid interference, the two systems can share common frequencies as longas any specific frequency location is not simultaneously used by the twosystems.

[0236] In order to improve coordination between base units, whether partof the same security network 400 or separate but nearby securitynetworks 400, it may be advantageous for the base units 200 tosynchronize their internal timing with each other. Since any chosen RFaccess protocol will likely organize its transmissions into bursts,operation of the systems will typically be improved if the timingbetween base units 200 is synchronized so that bursts are bothtransmitted and received at expected times. One method by which this maybe accomplished is by establishing one base unit 200 as a timing master;then each other base unit 200 may derive its own internal timing bysynchronizing with the timing master. This synchronization may beaccomplished by the base unit 200 listening to certain burststransmitted from the timing master and then adjusting the base unit'stiming accordingly. This may be accomplished, for example, by monitoringthe framing boundaries or synchronization words of transmitted frames.The base unit 200 designated as timing master may or may not be the sameas the device containing the present master controller 251.

[0237] If sufficient timing and frequency coordination between separatebut nearby security networks 400 has been established, these separatesystems may also communicate with each other by establishing periodicfrequencies and times at which messages are passed between the systems.This ability to pass messages between adjacent systems enables variousforms of neighborhood networking to take place as described herein.

[0238] The RF access protocol may establish periods of time forcommunications between base units 200 and periods of time forcommunications between base units 200 and transponders 100. Base units200 will typically transmit a wireless signal to the transponders atperiodic intervals. During the time of these transmitted wirelesssignals, the passive transponders 150 may elect to backscatter modulatethe transmitted wireless signals if any of the passive transponders 150have information to communicate. The periodic intervals may changedepending upon the state of the security network 400. For example, whenthe security network 400 is in an armed state, the base units 200 maytransmit a wireless signal to passive transponders 150 every twoseconds. This means that any state change at an intrusion sensor may becommunicated to the master controller 251 within two seconds. However,when the security network 400 is in a disarmed state, the base units 200may slow down their rate of transmitting wireless signals to the passivetransponders 150 to every 30 seconds, for example, in to conserve power.The actual times may vary in practice, of course.

[0239] The rate of scanning is one of several parameters that the baseunits 200 may transmit to the transponders 100. These parameters as agroup may be used by the various transponders 100 to determine theirrespective operation. The rate of scanning may be used by thetransponders 100 to determine how often the transponders 100 shouldattempt to receive communications from the base units 200 as well aswhen and how often a transponder 100 has an opportunity to respond to awireless communications from the base unit 200. Transponders 100 mayplace some or all its circuits to sleep during intervals of time whenthe transponder 100 is not expecting to receive communications nor hasany data to send. As the rate of scanning changes, the length of sleepintervals may also change.

[0240] The RF access protocol may or may not include encryption andauthentication as part of its message structure. Radio waves canpropagate over significant distances, and the communications betweenbase units 200 and with transponders 100 can be intercepted by atechnically knowledgeable intruder. If the designer of a securitynetwork 400 under the present invention is concerned about theinterception of communications, the messages may be encrypted. Duringthe manufacture and/or configuration of the security network 400, keysmay be provided to the various active and passive transponders. Once thedevices have the keys, and the keys are known by the controllerfunctions, the keys may be used for authentication and/or encryption.

[0241] Authentication is a process that typically involves thedetermination of a challenge message using a predetermined method andtypically involving at least one key. The challenge message is then sentfrom a first device to a second device. The second device typically thendetermines a response message using a predetermined method and typicallyinvolving both the challenge message and at least one key. The premiseis that only a valid second device knows both the method and the keyrequired to properly respond to the challenge from the first device.There are many authentication processes known by those skilled in theart, almost any of which can be applied to the present security network400.

[0242] Encryption is a related process that typically involves both afirst key and a predetermined method for using the first key to encodeor encrypt a message. The encrypted message is then sent from a firstdevice to a second device. The second device can typically decrypt ordecode the message using a predetermined method and typically involvinga second key known to the second device. The first key and the secondkey may be the same, or may have some other predetermined relationshipthat allows one key to decrypt messages from another key. It may beadvantageous for the keys to be different so that if one key iscompromised, it is possible to maintain the integrity of the remainderof the system.

[0243] The present security network 400 may be controlled by the uservia a keypad 265, which may be implemented in a handheld unit 260 ortabletop unit 261 for example. However, the present security network 400also supports a novel method for configuration primarily using voicerecognition. This novel method is not necessarily specific to a securitynetwork 400 employing communication methods as disclosed herein, but mayalso be applied to other types of security systems such as those of theprior art.

[0244] Most security networks 400, especially those that will bemonitored, include a modem 310. In the security network 400 of thepresent invention, the modem 310 is contained in a gateway 300. Then,after all of the components of the security network 400 are installed inthe building and the modem is connected to the telephone line 431 thefollowing process is then used to configure the security network 400:

[0245] 1. The user 712 (or owner or operator) uses a base unit 200 withan acoustic transducer 210 or even a telephone 455 connected to the sametelephone line 431 as the modem 310 to call a remote server or remoteprocessor 461, which may typically be located at a emergency servicescenter 460. The user interaction is depicted by arrow A in FIG. 19.

[0246] 2. The remote processor 461 runs a configuration program that mayinclude voice recognition and voice response. Data may be exchangedbetween the configuration program on the remote processor 461 and themodem 310 using DTMF, data over voice, data under voice, or similarmodulation techniques that enable voice and data to share the sametelephone line 431 (data exchange is depicted by arrow B in FIG. 19).Furthermore, data may be exchanged between base units 200 (depicted byarrow C in FIG. 19) and between base units 200 and transponders 100(depicted by arrows D in FIG. 19) during the configuration process.

[0247] 3. When the user has finished the configuration program, the usermay hang up the telephone 455 or terminate the voice conversation on thebase unit 200 with acoustic transducer 210. However, the modem 310attached to the same telephone line 431 may hold the telephone line 431active.

[0248] 4. The remote processor 461 and the modem 310 may engage in adata exchange in which software, parameters, and other configurationdata may be downloaded.

[0249] 5. The modem 310 release the telephone line 431 when the downloadis complete.

[0250] There are many advantages to this configuration process:

[0251] The security network 400 is not burdened with the program codeand data required to run a configuration program that includes voicerecognition and voice response. The amount of memory required to supportthis program code and data can be substantial, and it is generally onlyrequired at initial setup.

[0252] The remote processor 461 can have more substantial processingpower, and therefore execute more complex algorithms for voicerecognition than a low cost microprocessor that might typically be usedin a security network 400. More complex algorithms will generallyperform with better voice recognition accuracy. Additionally, the remoteprocessor 461 can include the data to support multiple languages so thatthe user can interact in the language most comfortable to the user.

[0253] The remote processor 461 can customize the configuration programqueries and responses to the exact configuration present in the securitynetwork 400. For example, if the security network 400 contains only twotransponders 100, then the configuration program need only ask the userto identify the labels or names of the two transponders 100 rather cancontinuing in an endless loop that the user must manually terminate.

[0254] During the data exchange (arrow B), updated software can bedownloaded into the security network 400. By calling the remoteprocessor 461 prior to using the security network 400, the user 712 isensured of always receiving the latest version of software, even if thesecurity network 400 was manufactured many months before the actualpurchase.

[0255] During the configuration program, the user 712 can be offeredadditional software-based features for purchase. These features may notbe part of the basic security network 400. If the user chooses topurchase the additional software-based features, this new software canbe downloaded to the security network 400 during the data exchange(arrow B).

[0256] The remote processor 461 maintains a copy of the configurationfor the security network 400 in a database in the event of catastrophicloss of data in the security network 400. The user can retrieve theconfiguration from the database in the remote processor 461 wheneverneeded.

[0257] As needed or requested, the remote processor 461 can send copiesof the configuration to an emergency response agency 460. If necessary,the remote processor 461 can convert the format of the configurationdata into a format compatible with the requirements of the appropriateemergency response agency 460. These formats may vary from one agency toanother, and therefore the security network 400 is not burdened with theprogram code necessary to support multiple formats.

[0258] The user 712 can create his or her own spoken labels fordifferent zones, base units 200, transponders 100, or other componentsof the security network 400. In the case of the inventive securitynetwork 400, which can support voice response, these labels can bedownloaded to the inventive security network 400 during the dataexchange. Then, if the security network 400 needs to identify a specificzone, base unit 200, transponder 100, or other component, the inventivesecurity network 400 can play back the user's 712 own spoken label viaan acoustic transducer 210 in a base unit 200.

[0259] It is preferable that the remote processor 461 and the securitynetwork 400 engage in an authentication and/or encryption process toprotect the configuration data exchanged between the remote processorand the security network 400. While it is unlikely that an intruderwould be monitoring the telephone line 431 at the exact moment that theuser 712 (or owner or operator) is configuring the security network 400for the first time, it is possible that a technically knowledgeableintruder might attempt later to compromise the security network 400 byaccessing the telephone line 431 exterior to the building. For example,one attempt at compromise might be to connect a telephone to thetelephone line 431 exterior to the building, call the remote processor461, and attempt to reconfigure the security network 400.

[0260] One means by which the security network 400 and its configurationcan be protected is by storing a user identity, a password, and a key atthe remote server or remote processor 461. When a user calls the remoteprocessor 461 for the first time, the security network 400 attached viathe modem 310 to the telephone line 431 will be in a starting state withno configuration. There will also be no user record on the remoteprocessor 461. The user 712 will be required to initiate a user record,beginning with a user identity and password. The user identity may bethe home telephone number, or any other convenient identity. The remoteprocessor 461 may detect that the security network 400 is in a startingstate, and can assign a first key to the user record and a second key tothe security network 400. The first and second keys may be the same keyor may another predetermined relationship that enables the remoteprocessor 461 and the security network 400 to engage in anauthentication process and/or an encryption process. Different types ofauthentication and encryption processes are known to those skilled inthe art, and any acceptable process may be implemented. An example ofeach process has been provided herein. Instead of the remote processor461 assigning a key to the security network 400, it is also acceptablefor the security network 400 to contain a predetermined key that is thenprovided to the remote processor 461 by the user or the security network400. It is preferable that whichever method is used for the exchange ofkeys between the user, security network 400, and remote processor 461,that the keys be provided only once over the telephone line. Keys aremost useful when their values are not discovered by someone that mightattempt an intrusion, and by providing the keys only once the chances ofdiscovery by monitoring the telephone line 431 are minimized.

[0261] Once the remote processor 461 contains a first key associatedwith the user record, and the security network 400 contains a secondkey, any attempt to change the configuration of the security network 400will require the use of the keys. An intruder attempting to compromisethe security network 400 by accessing the telephone line 431 exterior tothe building would be required to know the user identity and password inorder to access the user record in the remote processor 461, and thefirst key can only be used by accessing the user record.

[0262] The inventive security network 400 can assist the user during theconfiguration program by providing certain data (arrows B, C, D) to theremote processor 461 during the call while the user is interacting(arrow A) with the configuration program. The certain data may includethe number of base units 200, the transponders 100 within detectionrange of each base unit 200, and the number of gateways 300 and otherdevices within the security network 400. This data may be sent to theremote processor 461 while the user is interacting with theconfiguration program (arrow A) either by modulating the data outside ofthe normal audio bandwidth of a telephone call or using a modulationlike DTMF tones to send the data within the audio bandwidth. In asimilar manner, the remote processor 461 may send certain commands tothe security network 400. For example, it may be advantageous for theremote processor 461 to cause certain base units 200 to emit a shorttone or spoken phrase to identify itself. Then the user 712 may providean audio label to the base unit 200 that had emitted the short tone.

[0263] While advantageous, it is not required that the security network400 exchange data on the same telephone line or telecommunicationsinterface on which the user is interacting with the remote processor461. It is also possible for the security network 400 to connect to theremote processor 461 using one telecommunications interface, such as anEthernet based interface, while the user is interacting with the remoteprocessor 461 using a telephone line, for example. The remote processor461 may authenticate the user using a password and may separatelyauthenticate the security network 400 using an authentication key.

[0264] One advantageous interface mechanism available for use with thesecurity network 400 is voice recognition and voice response. When abase unit 200 is manufactured with an acoustic transducer 210, the baseunit 200 can also include software based functionality in the programcode 251 to interpret spoken words as commands to the security network400. Similarly, the security network 400 can respond to spoken wordcommands with spoken word responses or tones. Software to perform voicerecognition and voice response is widely available and known to thoseskilled in the art, though most existing software must be modified tosupport the relative noisy environment of the typical home. U.S. Pat.No. 6,574,596, issued to Bi, et al, provides one example description ofvoice recognition, as does several well known textbooks. With the voicerecognition and voice response as the primary interface mechanism, it ispossible to implement a version of the inventive security network 400with no keypad 265. The base units 200 with acoustic transducers 210 canbe used by authorized users to perform various functions, including theday to day functions such as arming and disarming the system. Oneattractive advantage of incorporating voice recognition and voiceresponse into the security network 400 via the acoustic transducer 210in the base unit 200 is that the security network 400 can be armed ordisarmed from any room in the house in which a base unit 200 isinstalled. The voice commands received at a single base unit 200 can becommunicated to the controller functions 250 of all other devices in thesecurity network 400.

[0265] In addition to its support of multiple modulation schemes, thebase unit 200 is available in an embodiment with multiple antennas 206that enables the base unit 200 to subdivide the space into which thebase unit 200 transmits and/or receives. It is well known in antennadesign that it is desirable to control the radiation pattern of antennasto both minimize the reception of noise and maximize the reception ofdesired signals. An antenna that radiates equally in all directions istermed isotropic. An antenna that limits its radiation into a largedonut shape can achieve a gain of 2 dBi. By limiting the radiation tothe half of a sphere above a ground place, an antenna can achieve a gaina 3 dBi. By combining the two previous concepts, the gain can be furtherincreased. By expanding upon these simple concepts to create antennasthat further limit radiation patterns, various directional gains can beachieved. The base unit 200 circuit design permit the construction ofembodiments with more than one antenna, whereby the transceiver circuitscan be switched from one antenna to another. In one embodiment, the baseunit 200 will typically be plugged into an outlet 720. Therefore, thenecessary coverage zone of the base unit 200 is logically bounded by theplanes created by the floor below the reader and the wall behind thereader. Therefore, relative to an isotropic antenna, the read zone ofthe base unit 200 should normally be required to cover the spacecontained within only one-quarter of a sphere. Therefore, a singleantenna configured with the base unit 200 should typically be designed again of approximately 6 dBi.

[0266] However, it may be desirable to further subdivide this space intomultiple subspaces, for example a “left” and a “right” space, withantenna lobes that overlap in the middle. Each antenna lobe may be thenable to increase its design gain to approximately 9 dBi or more. Sincethe base units 200 and transponders are fixed, the base unit 200 can“learn” in this example “left”/“right” configuration which transpondershave a higher received signal strength in each of the “left” and “right”antennas 206. The simplest method by which this can be achieved is withtwo separate antennas 206, with the transceiver circuits of the baseunit 200 switching between the antennas 206 as appropriate for eachtransponder 100. This enables the base unit 200 to increase its receiversensitivity to the reflected signal returning from each transponder 100while improving its rejection to interference originating from aparticular direction. This example of two antennas 206 can be expandedto three or four antennas 206. Each subdivision of the covered spaceresults can allow a designer to design an increase in the gain of theantenna 206 in a particular direction. Because the physical packaging ofthe base unit 200 has physical depth proportionally similar to itswidth, three antenna 206 patterns is a logical configuration in which tooffer this product, where one antenna 206 looks forward, one looks left,and the other looks right. An alternate configuration which is equallylogical, can employ four antennas 206, one antenna 206 looks forward,the second looks left, the third looks right, and the fourth looks up.These example configurations are demonstrated in FIG. 22A and 22B. Toaid in visual understanding, the antennas shown in FIG. 22A and 22Bappear to be microstrip or patch antennas, however the invention is notintended to be limited to those antenna forms. Other forms of antennassuch as dipole, bent dipole, helical, etc. that are well known in theart can also be used without subtracting from the invention.

[0267] There are multiple manufacturing techniques available whereby theantennas can be easily printed onto circuit boards or the housing of thebase unit 200. For example, the reader is directed to Compact andBroadband Microstrip Antennas, by Kin-Lu Wong, published by Wiley, 2002as one source for a description of the design and performance ofmicrostrip antennas. This present specification is not recommending thechoice of any one specific antenna design, because so much relies on thedesigner's preference and resultant manufacturing costs. However, whenconsidering the choice for antenna design for both the base unit 200 andthe transponder 100, the following should be taken into consideration.Backscatter modulation relies in part upon the Friis transmissionequation and the radar range equation. The power P_(r) that thereceiving base unit 200 can be expected to receive back from thetransponder 100 can be estimated from the power P_(t) transmitted fromthe transmitting base unit, the gain G_(t) of the transmitting base unit200 antenna, gain G_(r) of the receiving base unit 200 antenna, thewavelength λ of the carrier frequency, the radar cross section σ of thetransponder 100 antenna, and the distances R₁ from the transmitting baseunit 200 to the transponder 100 and R₂ from the transponder 100 to thereceiving base unit 200.(Since more than one base unit 200 can receive awireless communications from the transponder, the general case isconsidered here.) The radar range equation is then:

P _(r) =P _(t) ·σ·[G _(t) ·G _(r)/4π]·[λ/4πR ₁ R ₂]²

[0268] Therefore, the designer should consider antenna choices for thebase units 200 and transponders that maximize, in particular, G_(r) andσ. The combination of P_(t) and G_(t) cannot result in a field strengththat exceeds the prescribed FCC rules. The foregoing discussion ofmicrostrip antennas does not preclude the designer from consideringother antenna designs. For example, dipoles, folded dipoles, and logperiodic antennas may also be considered. Various patents such as U.S.Pat. Nos. 6,147,606, 6,366,260, 6,388,628, 6,400,274, among others showexamples of other antennas that can be considered. Unlike otherapplications for RFID, the security network 400 of the present inventionuses RFID principles in a primarily static relationship. Furthermore,the relationship between the base unit 200 antennas and transponder 100antennas will typically be orthogonal since most buildings and homeshave a square or rectangular layout with largely flat walls. This priorknowledge of the generally static orthogonal layout should present anadvantage in the design of antennas for this RFID application versus allother RFID applications.

[0269] In addition to performing the functions described herein within asingle building or home, the security network 400 in one building canalso operate in concert with an inventive security network 400 installedin one or more other buildings through a networking capability. Thereare two levels of networking supported by the security network 400:local and server-based. Local networking operates using high power RFcommunications between security networks 400 installed in two differentbuildings. Because of the power levels supported during high power RFcommunications, the distance between the security networks 400 in thetwo buildings can be a mile or greater, depending upon terrain. Each ofthe security networks 400 remains under the control of their respectivemaster controllers 251, and the controller function 250, including boththe program code 251 and configuration data 252, of each device remainsdedicated to its own security network 400. However, an authorized userof one security network 400 and an authorized user of a second securitynetwork 400 can configure their respective systems to permitcommunications between the two said security networks 400, therebycreating a network between the two systems. This network can existbetween more than just two systems; for example, an entire neighborhoodof homes, each with an inventive security network 400, can permit theirrespective security networks 400 to network with other security networks400 in the neighborhood.

[0270] When two or more security networks 400 are networked using highpower RF communications, various capabilities of each security network400 can be shared. For example, a first security network 400 in a firsthome 740 can access a gateway 300 associated with a second securitynetwork 400 in a second home 741 (as shown in FIG. 17). This may beadvantageous if, for example, an intruder were to cut the phone lineassociated with the first home 740, thereby rendering useless a gateway300 containing a modem 310 installed in the first security network 400.It is unlikely that an intruder would know to cut the phone linesassociated with multiple homes. In another example, if a child wearing atransponder 100 associated with the first security network 400 ispresent in the second home, the second security network 400 cancommunicate with the transponder 100 on the child and provide thereceived transponder 100 data to the first security network 400, therebyenabling a parent to locate a child at either the first home or thesecond home. In yet another example, if the first security network 400in the first home 740 causes an alert the first security network 400 canrequest the second security network 400 to also cause an alert therebynotifying the neighbors at the second home 741 of the alert and enablingthem to investigate the cause of the alert at the first home 740. Thismay be useful if for example the occupants are away on travel. In yetanother example, the base units 200 in a second security network 400 ina second home 741 may be within communications range of the transponders100 in a first security network 400 in a first home 740. The base units200 in the second security network 400 may forward any receivedcommunications to the controller function in the first security network400, thereby providing another form of spatial antenna diversity. Thismay be particularly useful for any transponders 100 located outside ofthe home where the first security network 400 is installed.

[0271] When two security networks 400 are beyond the range ofcommunications via high power RF communications, the security networks400 may still form a network through their respective gateways. Thesecurity networks 400 may either network through direct connectionbetween their respective gateways 300 or may network through anintermediate server 461. The use of an intermediate server 461 canenable the first security network 400 and the second security network400 to have different types of communications modules (i.e. modem,Ethernet, WiFi, USB, wireless, etc.) installed in the gateway 300 ofeach respective security network 400. Since a commercial emergencyresponse agency 460 will likely already have servers 461 equipped tosupport the various types of communications modules installed in variousgateways, the provision of an intermediate server for networkingsecurity networks 400 may present an expanded business opportunity.

[0272] Networking through intermediate servers 461 expands theapplications and usefulness of the inventive security network 400. Forexample, there may be a caregiver that would like to monitor an elderlyparent living alone in another city. Using the networking feature, thecaregiver can monitor the armed/disarmed status of the security network400 in the home of the elderly parent, use two-way audio and/or thecamera 213 of the security network 400 to check on the elderly parent,and monitor any transponder 100 worn by the elderly parent. This may beequally useful for parents to monitor a student living away at collegeor other similar family situations.

[0273] In either form of networking, the security network 400 canprovide an authentication mechanism to ensure that networking is notinadvertently enabled with another unintended security network 400. Theauthentication mechanism may consist of the mutual entering of an agreedsecurity code in each of the two security networks 400 which are tonetwork. In their communications with each other, the two securitynetworks 400 may send and verify that the security codes properly matchbefore permitting various operations between the two systems. Otherauthentication mechanisms may also be used, such as the shared used of adesignated master key. In this example, rather that requiring the mutualentering of an agreed security code, each of the security networks 400which are to network can be required to first read the same designatedmaster key.

[0274] Other embodiments of transponders 100 may exist under the presentinvention. Two example forms of passive infrared sensors 570 can becreated by combining a passive infrared sensor 570 with the circuits ofthe transponder 100. As shown in FIG. 14A, in one embodiment the passiveinfrared sensor 570 with its power supply 207 is integrated into thepackaging of a light switch 730. Within this same packaging, atransponder 100 is also integrated. The passive infrared sensor 570operates as before, sensing the presence of a warm body 710. The outputof the passive infrared sensor 570 circuits are connected to thetransponder 100 whereby the transponder 100 can relay the status of thepassive infrared sensor 570 (i.e. presence or no presence of a warm body710 detected) to the base unit 200, and then to the master controller251. At the time of system installation, the master controller 251 isconfigured by the user thereby identifying the rooms in which the baseunits 200 are located and the rooms in which the passive infraredsensors 570 are located. If desired, the master controller 251 can thenassociate each passive infrared sensor 570 with one or more base units200 containing microwave Doppler algorithms. The master controller 251can then require the simultaneous or near simultaneous detection ofmotion and a warm body, such as a person 710, before interpreting theindications as a probable person in the room.

[0275] It is not a requirement that the passive infrared sensor 570 bepackaged into a light switch 730 housing. As shown in FIG. 14B, inanother embodiment the passive infrared sensor 570 is implemented into astandalone packaging. In this embodiment, both the passive infraredsensor 570 and the transponder 100 are battery 208 powered so that thissensor/transponder 100 combination can be located anywhere within aroom. So, for example, this embodiment allows the mounting of thisstandalone packaging on the ceiling, for a look down on the coveredroom, or the mounting of this standalone packaging high on a wall.

[0276] A single security network 400 is comprised of various embodimentsof base units 200 and transponders that the end-user desires toassociate with each other. There may be multiple security networks 400installed in close proximity to each other, such as within a singlebuilding, group of buildings, or neighborhood. It is therefore importantthat the proper base units 200 and transponders 100 become enrolled withthe proper security network 400, and not mistakenly enrolled with thewrong security network 400. Base units 200 that are enrolled with themaster controller 251 of a security network 400 may be controlled bythat master controller 251. Similarly, transponders 100 enrolled withthe master controller 251 of a security network 400 will be monitored bythat security network 400. For the purposes of describing the variousprocesses and states during configuration and enrollment, theterminology following of the following paragraph shall be used.

[0277] The security network 400 within an end-user's residence (orsimilar singular premise, whether residential, commercial, or otherwise)shall be termed the home security network 400. This example residencemay be 740 in FIG. 17. Other security networks 400 within RFcommunications range of the home security network 400, but whosecomponents are not owned by the end-user or intended to be enrolled withthe home security network 400, are termed neighbor security networks400. This may be in example residence 741. There may, of course, bemultiple neighbor security networks 400 within RF communications rangeof the home security network 400. Individual components of a securitynetwork 400, such as the various embodiments of base units 200 andtransponders 100, may be in one of two states with respect to thevarious processes of configuration and enrollment: enrolled or notenrolled. Each security network 400 will typically have a separatenetwork identifier, or network ID, that is unique from the network ID ofall other security networks 400 within RF communications range of thesecurity network 400. Individual components of a home security network400, such as the various embodiments of base units 200 and transponders100, will typically each have a serial number that is unique from theserial numbers of other components in use any neighbor security network400 within RF communications range of the home security network 400. Theserial number for a specific component may or may not be assigned at thetime of manufacture. If the serial number is not assigned at the time ofmanufacture, the home security network 400 for a component may assign aserial number to that component. This may typically happen, for example,at the time of enrollment. It is particularly advantageous if the serialnumbers assigned to components were encoded in a manner that identifiedthat type of component. For example, a different numeric or alphanumericrange may be assigned to each type of component.

[0278] When a component is first purchased and brought within RFcommunications range of a home security network 400, it will typicallybe in a state of ‘not enrolled’. The component will remain in a state ofnot enrolled until the home security network 400 takes action to enrollthat component. If the component, such as a base unit 200 or atransponder 100, contains a power source, such as a battery, or becomespowered, such as by plugging the component into an outlet, connecting abattery, or receiving transmitted RF power, the component may begincommunicating according to a predetermined algorithm. The home securitynetwork 400 may receive communications from the component, even thoughin the state of not enrolled, but may not manage or monitor thecomponent. The home security network 400 may notify the end-user that acomponent has been detected, but that the component is in a state of notenrolled. The end-user may then decide whether to enable the homesecurity network 400 to enroll the component with the home securitynetwork 400.

[0279] Some components may be capable of storing their enrolled/notenrolled state within the component itself. Other components may not becapable of storing their enrolled/not enrolled state, and therefore thehome security network 400 must store the enrolled/not enrolled state ofthe component. Typically, base units 200 will contain the necessarystorage mechanism to store their enrolled/not enrolled state. Similarly,some transponders 100 will also contain the necessary storage mechanismto store their enrolled/not enrolled state.

[0280] When a home security network 400 receives communications from acomponent, the serial number of the component may be entered into atable, which said table will typically be located in a memory 211 of themaster controller 251 of the home security network 400. If the componenthas a state of enrolled, then the home security network 400 willtypically not be required to take any further action. If the componenthas a state of not enrolled, then the home security network 400 mayexchange communications with neighbor security networks 400 to determinewhether any of the neighbor security networks 400 have receivedcommunications from the same component, but have entered the componentinto their respective tables with a state of enrolled. If so, then thehome security network 400 may enter the component into a table, butrecord the state of the component as enrolled with a neighbor securitynetwork 400. In this manner and over time, the home security network 400may continue to add components to a table, in each case entering eachcomponent as enrolled with the home security network 400, enrolled witha neighbor security network 400, or not enrolled. When the state of acomponent has been determined to be enrolled in a neighbor securitynetwork 400, the home security network 400 may forward anycommunications received from the said component to the neighbor securitynetwork 400. In this manner, the home security network 400 may provideantenna and communications diversity for the component in ensuring thatthe component's communications reaches the neighbor security network400.

[0281] When the home security network 400 has received communicationsfrom a component and the component is in a state of not enrolled in theeither the home security network 400 or in any neighbor network, theend-user may decide to enroll the component in the home security network400. A designer may choose any of various means, typically through auser interface, in which to enable the home security network 400 tonotify the end-user of the not enrolled component, and then enable theend-user to permit the component to become enrolled in the home securitynetwork 400. During process of enrollment, the end-user may be permittedto associate specific components with each other or with locations onthe end-user's premises. For example, a component installed in theliving of the end-user's house may be labeled within the home securitysystem as a living room window transponder 100.

[0282] For components that are capable of storing their enrolled or notenrolled state, the components may use different serial numbers in theircommunications when enrolled and when not enrolled. For example, whenits state is not enrolled a component may use a first serial number of afirst predetermined length. When the same component is in an enrolledstate, the same component may use a second serial number of a secondpredetermined length. The second predetermined length may be shorterthan the first predetermined length, and the second serial number may bean abbreviated form of the first serial number. This may enable shortertransmissions when the component is an enrolled state. On the otherhand, the second predetermined length may be longer than the firstpredetermined length. For example, when a component is an enrolled statethe second serial number may be a combination of the first serial numberand the network ID of the home security network 400. The presence of thenetwork ID of the home security network 400 in the second serial numbermay be used in the routing of communications. For example, a neighborsecurity network 400 may receive a communications from a component anduse the second serial number to identify that the component is enrolledwith the home security network 400 and may forward the communications tothe said home security network 400.

[0283] In addition to allowing an end-user to permit a component to beenrolled in the home security network 400, the home security network 400may also permit the end-user to assign a label to the component. Onemeans by while a label may be assigned to a component is by enabling theend-user to record a verbal label for the component. This verbal labelmay be stored in the master controller 251 or any other controllerfunction 250. If any base units 200 in the home security network 400have an audio transducer, then the audio labels may be played back tothe end-user at an appropriate time, such as when the security network400 signals an alarm condition.

[0284] If the transponder 100 has not been manufactured with apredetermined serial number, the base unit 200 can generate, using apredetermined algorithm, a serial number and, if desired, any otherinformation necessary to engage in encrypted communications and downloadthese said values to the transponder 100. If the transponder 100requires a power level higher than normally available to enable thepermanent programming of these downloaded values into itsmicrocontroller 106 or memory (in whatever form such as fuses, flashmemory, EEPROM, or similar), a base unit 200 can increase itstransmitted RF power subsequent to the downloading. No values need betransmitted during the period of higher transmitted RF power, andtherefore there is no risk of the values being intercepted outside ofthe close proximity of the base unit 200 and transponder 100. After thisparticular exchange, the transponder 100 is enrolled, and the mastercontroller 251 may provide some form of feedback, such as audible orvisual, to the user indicating that the transponder 100 has beenenrolled.

[0285] The base unit 200 is not limited to reading just the transponders100 installed in the openings of the building. The base unit 200 canalso read transponders 100 that may be carried by individuals 710 oranimals 711, or placed on objects of high value. By placing atransponder 100 on an animal 711, for example, the controller function250 can optionally ignore indications received from the motion sensorsif the animal 711 is in the room where the motion was detected. Byplacing a transponder 100 on a child, the controller function 250 canuse a gateway 300 to send a message to a parent at work when the childhas arrived home or equally important, if the child was home and thenleaves the home. The transponder 100 can also include a button than canbe used, for example, by an elderly or invalid person to call for helpin the event of a medical emergency or other panic condition. When usedwith a button, the transponder 100 is capable of reporting two states:one state where the transponder 100 simply registers its presence, andthe second state in which the transponder 100 communicates the “buttonpressed” state. It can be a choice of the system user of how tointerpret the pressing of the button, such as causing an alert, sendinga message to a relative, or calling for medical help. Because the baseunits 200 will typically be distributed throughout a house, this form ofpanic button can provide a more reliable radio link than prior artsystems with only a single centralized receiver.

[0286] Embodiments of base units 200 and transponders 100 may also bemade into forms compatible with various vehicles, water craft, lawn andfarm equipment, and similar types of valuable property. For example, oneembodiment of a base unit 200 or transponder 100 may be made in anexample physical embodiment of a cigarette lighter adaptor 436, as shownin FIG. 26. Given the wide use of cigarette lighter adaptors forcharging cell phones and powering other equipment, there are someexample vehicles that have cigarette lighters that are constantlypowered, even when the vehicle has been turned off. A base unit 200 ortransponder 100 in the form of a cigarette lighter adaptor 436 providesan easily installed means to monitor the vehicle against the risk oftheft. Of course, other forms of base units 200 and transponders 100 mayalso be designed that attach in other areas of vehicles, water craft,lawn and farm equipment, and similar types of property. Some forms maybe permanently wired. Even if a cigarette lighter has switched power, abase unit 200 or transponder 100 in the form of a cigarette lighteradaptor 436 may still be used if the said base unit 200 or transponder100 contains a battery. The battery may be periodically recharged whenthe vehicle is running. Since base units 200 are capable of high powerRF communications, their RF propagation range can be much farther than atransponder 100.

[0287] One advantageous security network 400 that may be formed mayinclude one base unit 200 or transponder 100 located in a vehicle and asecond base unit 200 that is handheld (i.e. example embodiment 260).Thus, the security network 400 is not permanently affixed to a building,but rather travels with the user. When a user drives to a mall, forexample, a first base unit 200 may remain in the vehicle and a secondbase unit 200 may be carried by the user, and the two base units 200 maycontinue their communications. If the first base unit 200 detects anattempted intrusion, the first base unit 200 may send a communicationsmessage to the second base unit, and the second base unit 200 may causean alert to notify the user. In addition, the first base unit 200 mayinclude a camera 213, as described elsewhere in this specification, andthe second base unit 200 may include a display 266 on which pictures maybe viewed. The first base unit 200 may periodically record and/or sendpictures to the second base unit, and in particular, the first base unit200 may record and/or send pictures during the time in which the firstbase unit 200 is detecting an attempted intrusion. This may enable theuser to obtain a picture based record of the activities involving thevehicle during the time when the parked and the user was away from thevehicle.

[0288] A user may configure a security network 400 in the home toinclude a base unit 200 or transponder 100 in vehicle when the vehicleis located within RF propagation range of a home security network 400 orneighbor security network 400. Similarly, a user may configure asecurity network 400 in the home to ignore a base unit 200 ortransponder 100 in vehicle when the vehicle has traveled outside of RFpropagation range of a home security network 400 or neighbor securitynetwork 400. This configuration features enables the base unit 200 ortransponder 100 in the vehicle to join the home security network 400 andtherefore the user can monitor the status of the vehicle when thevehicle is parked in or near to their home. The same base unit 200 ortransponder 100 in the vehicle can then be used as described above tomonitor the vehicle when the user has driven the vehicle to anotherlocation such as an example mall. This form of security network 400differs significantly from present forms of vehicle security systemsthat only make noise locally at the vehicle when the vehicle isdisturbed.

[0289] The inventive security network 400 provides a number ofmechanisms for users and operators to interface with the securitynetwork 400. The security network 400 may include a base unit 200 with akeypad 265 similar to a cordless phone handset 260 or cordless phonebase 261 as shown in FIG. 4 since it is a convenient means by whichauthorized persons can arm or disarm the system and view the status ofvarious zones. There are a number of keypad options that can be madeavailable for the security network 400, derived from permutations of thefollowing possibilities: (i) high power RF communications or backscattermodulation communications, (ii) AC powered or battery powered, and ifbattery powered, rechargeable, and (iii) inclusion, or not, ofsufficient processing and memory capability to also support a controllerfunction. The example handset 260 design contains the added advantage ofsupporting cordless phone functionality. Thus, the security network 400design can serve a dual purpose for users—security monitoring and voiceconversation—through a single network of base units 200. Thehandset-shaped 260 base unit 200 with keypad will typically be battery208 powered, with the battery 208 being rechargeable in a manner similarto existing cordless phones. One or more other base units 200 in thesecurity network 400 may contain gateway 300 functionality including aconnection to a telephone line 431, Ethernet 404, WiFi 404, or wireless402 network. Like all base units 200, the handset-shaped 260 base unit200 with keypad 265 and the base units 200 with gateway 300functionality can support high power RF communications with each other.This high power RF communications can support voice conversation inaddition to exchanging data for the operation of the security network400.

[0290] The inventive security network 400 may include a means to providealerts without calling the attention of an intruder to base units 200.One means by which this may be accomplished is a remote sounder 437. Aremote sounder 437 should be less expensive than a base unit 200 with anaudio transducer 210 because the remote sounder 437 contains only thefunctionality to receive commands from a base unit 200 and to providethe desired alert characteristics such as an audio siren. On exampleremote sounder 437 is shown in FIG. 26. This remote sounder 437 has beenconstructed in the shape of a lamp socket, such that (i) a light bulbmay be removed from a lamp socket, (ii) the remote sounder 437 isscrewed into the lamp socket, and then (iii) the light bulb is screwedinto the remote sounder 437. This example remote sounder 437 containsthe mechanical means to (i) fit between a light bulb and a lamp socket,and (ii) pass AC power through the remote sounder, and also to (iii)obtain AC power from the lamp socket, (iv) receive communications frombase units 200 using high power or low power RF communications, and (v)cause an audio siren when commanded by the master controller 251. Ifdesired, the remote sounder 437 may support two-way communications suchthat the master controller 251 may provide positive feedback from theremote sounder 437 that a message to alert or stop alerting has beenreceived. Alternately, if one or more base units 200 in a securitynetwork 400 contain an audio transducer 210 that can input audio, thenthe master controller 251 can receive feedback by commanding the one ormore base units 200 to determine whether the audio siren on the remotesounder 437 is generating audio volume that can be detected by the oneor more base units 200.

[0291] In addition to detecting intrusion, the security network 400 canmonitor the status of other environmental quantities such as fire,smoke, heat, water, gases, temperature, vibration, motion, glassbreakage as well as other measurable events or items, whetherenvironmental or not (i.e. presence, range, location) by using anappropriate sensor 620. The list of sensor 620 possibilities is notmeant to be exhaustive, and many types of sensors 620 already existtoday. For each of these sensor 620 types, the security network 400 maybe configured to report an alert based upon a change in the condition orquantity being measured, or by said condition or quantity reaching aparticular relationship to a predetermined threshold, where therelationship can be, for example, one or more of less than, equal to, ormore than (i.e. a monitored temperature is less than or equal to apredetermined threshold such as the freezing point).

[0292] These detection devices can be created in at least two forms,depending upon the designer's preference. In one example embodiment, anappropriate sensor 620 can be connected to a transponder 100, in amanner similar to that by which an intrusion sensor 600 is connected tothe transponder 100. All of the previous discussion relating to thepowering of an LED generator 601 by the transponder 100 applies to thepowering of appropriate sensors 620 as well. This embodiment enables thecreation of low cost sensors 620, as long as the sensors 620 are withinthe read range of base units.

[0293] In a second example embodiment, these sensor devices may beindependently powered, much as base units 200 and gateways 300 areindependently powered. Each of these detection devices are created bycombining a sensor 620 appropriate for the quantity being measured andmonitored with a local power supply 264, processor 261, and acommunications means 262 that may include high power RF or backscattermodulation communications. These sensor 620 devices may find great usein monitoring the status of unoccupied buildings, such as vacationhomes. A temperature sensor may be useful in alerting a remote buildingowner if the heating system has failed and the building plumbing is indanger of freezing. Similarly, a flood prone building can be monitoringfor rising water while otherwise unoccupied.

[0294] The base unit 200 is typically designed to be inexpensivelymanufactured since in each installed security network 400, there may beseveral base units. From a physical form factor perspective, the baseunit 200 of the present invention can be made in several embodiments.One embodiment particularly useful in self-installed security networks400 is shown in FIG. 13, where the packaging of the base unit 200 mayhave the plug integrated into the package such that the base unit 200 isplugged into a standard outlet 720 without any associated extensioncords, power strips, or the like.

[0295] From a mechanical standpoint, one embodiment of the base unit 200may be provided with threaded screw holes on the rear of the packaging,as shown in FIG. 24A. If desired by the user installing the system ofthe present invention, holes can be drilled into a plate 722, which maybe an existing outlet cover (for example, if the user has stylizedoutlet covers that he wishes to preserve) whereby the holes are of thesize and location that match the holes on the rear of the packaging forthe base unit, for example. Alternately, the user can employ a plate inthe shape of an extended outlet cover 721 shown in FIG. 24B whichprovides additional mechanical support through the use of additionalscrew attachment points. Then, as shown in FIGS. 24A and 24B, the plate722 or 721 can be first attached to the rear of the base unit 200packaging, using the screws 724 shown, and if necessary, spacers orwashers. The base unit 200 can be plugged into the outlet 720, wherebythe plate 722 or 721 is in alignment with the sockets of the outlet 720.Finally, an attachment screw 723 can be used to attach the plate 722 or721 to the socket assembly of the outlet 720. This combination of screwsprovides positive mechanical attachment whereby the base unit 200 cannotbe accidentally be jostled or bumped out of the outlet 720. Furthermore,the presence of the attachment screw 723 will slow down any attempt torapidly unplug the base unit 200.

[0296] In addition to the physical embodiments described herein, variouscomponents of the security network 400 can be manufactured in otherphysical embodiments. For example, modern outlet boxes used for bothoutlets and light switches are available in sizes of 20 cubic inches ormore. In fact, many modern electrical codes require the use of the theselarger boxes. Within an enclosure of 20 cubic inches or more, a baseunit 200 can be manufactured and mounted in a form integrated with anoutlet as shown in FIG. 23B or a light switch in a similarconfiguration. The installation of this integrated base unit 200 wouldrequire the removal of a current outlet, and the connection of the ACpower lines to the integrated base unit/outlet. The AC power lines wouldpower both the base unit 200 and the outlet. One or more antennas can beintegrated into the body of the base unit/outlet shown or can beintegrated into the cover plate typically installed over the outlet. Inaddition to a cleaner physical appearance, this integrated baseunit/outlet would provide the same two outlet connection points asstandard outlets and provide a concealed base unit 200 capability. In asimilar manner, an integrated base unit/light switch can also bemanufactured for mounting within an outlet box.

[0297] When the inventive security network 400 includes at least onegateway 300 with modem functionality, it is advantageous for thesecurity network 400 to seize the telephone line 431 if any othertelephony device 455(other than the security network 400 itself) isusing the telephone line 431 at the time that the security network 400requires use of the telephone line 431. Furthermore, while the securitynetwork 400 is using the telephone line 431, it is also advantageous forthe security network 400 to prevent other telephony devices 455 fromattempting to use the telephone line 431. Therefore, the securitynetwork 400 includes several means in which to seize the telephone line455 as shown in FIG. 18.

[0298] A gateway 300 containing modem 310 functionality may include twoseparate RJ-11 connectors of the type commonly used by telephones, faxmachines, modems, and similar telephony devices. The first of the RJ-11connectors is designated for connection to the telephone line 431 (i.e.PSTN 403). The second of the RJ-11 connectors is designated forconnection to a local telephony device 455 such as a telephone, faxmachine, modem, etc. The gateway 300 can control the connection betweenthe first and the second RJ-11 connector. The connection may becontrolled using mechanical means, such as a relay, or using siliconmeans such as a FET. When the security network 400 does not require useof the telephone line 431, the gateway 300 enables signals to passthrough the gateway 300 between the first and second RJ-11 connector.When the security network 400 requires use of the telephone line 431,the gateway 300 does not enable signals to pass through the gateway 300between the first and second RJ-11 connector. In a security network 400containing multiple gateways 300 with modem 310 functionality, thesecurity network 400 may command all gateways 300 to stop enablingsignals to pass through each gateway 300 between the respective firstand second RJ-11 connector of each gateway 300. Thus, all telephonydevices 455 connected through gateways to the telephone line 431 may bedisconnected from the telephone line 431 by the security network 400.

[0299] In a home or other building, there may be telephony devices 455connected to the telephone line 431 that do not connect through agateway 300. This may be because there are simply more telephony devices455 in the home than there are gateways 300 in the home, for example.The inventive security network 400 may therefore include telephonedisconnect devices 435 that can be used by the security network 400 todisconnect a telephony device 455 from the telephone line 431 undercommand of the security network. One embodiment of the telephonedisconnect device 435 is shown in FIG. 26. In this example embodiment,the telephone disconnect device 435 includes a first male RJ-11connector and a second female RJ-11 connector. The enables the exampletelephone disconnect device to be easily installed between an existingRJ-11 cord and an existing RJ-11 receptacle as shown. Other embodimentsare possible, such an embodiment that includes both first and secondfemale RJ-11 connectors. The telephone disconnect device 435 may obtainpower from the telephone line 431 or may be battery powered. Thetelephone disconnect device 431 can control the connection between thefirst and the second RJ-11 connector. The connection may be controlledusing mechanical means, such as a relay, or using silicon means such asa FET. When the security network 400 does not require use of thetelephone line 431, the telephone disconnect device 435 enables signalsto pass through the telephone disconnect device 435 between the firstand second RJ-11 connector. When the security network 400 requires useof the telephone line 431, the telephone disconnect device 435 does notenable signals to pass through the telephone disconnect device 435between the first and second RJ-11 connector. On a standard two-wiretelephone line 431, such as those commonly used for Plain Old TelephoneService (POTS), it is not necessary for the gateway 300 or the telephonedisconnect device 435 to prevent signals from passing on both wires inorder to seize the telephone line 431. Typically, even if signals ononly one of the wires of the two-wire telephone line is enabled or notenabled, the gateway 300 or the telephone disconnect device 435 canenable or prevent telephony devices 455 from accessing the telephoneline 431.

[0300] The telephone disconnect device 435 may obtain commands from thesecurity network 400 in any of several means. For example, the telephonedisconnect device 435 may contain a wireless receiver by which toreceive high power or low power RF communications from any base unit200. In another example, the telephone disconnect device 435 may containan audio receiver by which to receive communications from a base unit200. It may be desired that the telephone disconnect device 435 beindividually addressable so that the security network 400 can sendcommands to selected telephone disconnect devices 435 withoutsimultaneously addressing all of the telephone disconnect devices 435.In this example, a base unit 200, typically a gateway 300, may send anaudio signal or a sequence of audio signals over the telephone lines ofthe house. These audio signals may be detected by the various telephonedisconnect devices 435 as commands to either enable or not enabletelephony signals to pass through the telephone disconnect devices 435.Typically, even though a telephone disconnect device 435 will not permitsignals to pass between the telephone line 431 and any telephony device455 connected to the telephone disconnect device 435, the telephonedisconnect device 435 will remain connected to the telephone line 431and may therefore continue to receive commands put onto the telephoneline 431 by a base unit 200. In this example, the term audio tones mayinclude frequencies that are outside of the normal hearing of a person.For example, most telephone systems are designed to support audio belowapproximately 4,000 Hz. However, the present invention may employ audioat higher frequencies such as 10 KHz, 20 KHz, or even higher. Since itis not necessary or even preferred for the telephone network tointerpret the audio tones sent from a base unit 200 to a telephonedisconnect device 435, there may be an advantage to using audio tones atfrequencies higher that those normally supported in the telephonenetwork.

[0301] The true scope of the present invention is not limited to thepresently preferred embodiments disclosed herein. As will be understoodby those skilled in the art, for example, different components, such asprocessors or chipsets, can be chosen in the design, packaging, andmanufacture of the various elements of the present invention. Thediscussed embodiments of the present invention have generally relied onthe availability of commercial chipsets, however many of the functionsdisclosed herein can also be implemented by a designer using discretecircuits and components. As a further example, the base unit andtransponder can operate at different frequencies than those discussedherein, or the base units can use alternate RF communications protocols.Also, certain functions which have been discussed as optional may beincorporated as part of the standard product offering if customerpurchase patterns dictate certain preferred forms. Finally, thisdocument generally references US standards, customs, and FCC rules.Various parameters, such as input power or output power for example, canbe adjusted to conform with international standards. According, exceptas they may be expressly so limited, the scope of protection of thefollowing claims is not intended to be limited to the specificembodiments described above.

I claim:
 1. A cordless telephone system including at least one cordlessbase connected to a telecommunications interface and at least onehandset in wireless communications with the said cordless base, whereinthe said handset further contains a wireless receiver that can receivewireless communications from at least one wireless sensor.
 2. Thecordless telephone system in claim 1 wherein the said telecommunicationsinterface is a telephone line of the type typically provided by a publicswitched telephone network.
 3. The cordless telephone system in claim 1wherein the said telecommunications interface in an ethernet basedconnection or the type typically provided by wired or wireless internetservices.
 4. The cordless telephone system in claim 1 wherein the saidtelecommunications interface is a commercial mobile radio service. 5.The cordless telephone system in claim 1 wherein the said wirelesssensor can be used to detect intrusion.
 6. The cordless telephone systemin claim 1 wherein the said wireless sensor can be used to detect smoke.7. The cordless telephone system in claim 1 wherein the said wirelesssensor can be used to detect fire.
 8. The cordless telephone system inclaim 1 wherein the said wireless sensor can be used to detect thebreakage of glass.
 9. The cordless telephone system in claim 1 whereinthe said wireless sensor can be used to detect temperature.
 10. Thecordless telephone system in claim 1 wherein the said wireless sensoroperates in a first frequency band different from a second frequencyband that is used between the said cordless base and the said handset.11. The cordless telephone system in claim 1 wherein the said wirelesssensor operates under at least one subpart of FCC rule section 47 CFR15.231.
 12. The cordless telephone system in claim 1 wherein the saidwireless sensor operates in a first frequency range that is never usedduring wireless communications between the said cordless base and thesaid handset.
 13. The cordless telephone system in claim 1 wherein thesaid wireless sensor operates in a frequency band that is between 300MHz and 500 MHz.
 14. The cordless telephone system in claim 1 whereinthe said handset can forward a wireless communications received from thesaid wireless sensor to the said cordless base.
 15. The cordlesstelephone system in claim 1 wherein the said handset can interpret thewireless communications received from the said wireless sensor anddetermine whether to forward the wireless communications to the cordlessbase.
 16. The cordless telephone system in claim 1 wherein the saidhandset can send a message to the said cordless base indicating that thesaid wireless receiver has received a message from the said wirelesssensor.
 17. The cordless telephone system in claim 1 wherein the saidhandset can cause an audio alert.
 18. The cordless telephone system inclaim 18 wherein the cordless telephone system further contains a secondhandset and wherein the said audio alert is caused at the secondhandset.
 19. A cordless telephone system including at least one cordlessbase connected to a telecommunications interface and at least onehandset in wireless communications with the cordless base, wherein thesaid cordless base further contains a wireless receiver that can receivewireless communications from at least one wireless sensor.
 20. Thecordless telephone system in claim 19 wherein the saidtelecommunications interface is a telephone line of the type typicallyprovided by a public switched telephone network.
 21. The cordlesstelephone system in claim 19 wherein the said telecommunicationsinterface in an ethernet based connection or the type typically providedby wired or wireless internet services.
 22. The cordless telephonesystem in claim 19 wherein the said telecommunications interface is acommercial mobile radio service.
 23. The cordless telephone system inclaim 19 wherein the said wireless sensor can be used to detectintrusion.
 24. The cordless telephone system in claim 19 wherein thesaid wireless sensor can be used to detect smoke.
 25. The cordlesstelephone system in claim 19 wherein the said wireless sensor can beused to detect fire.
 26. The cordless telephone system in claim 19wherein the said wireless sensor can be used to detect the breakage ofglass.
 27. The cordless telephone system in claim 19 wherein the saidwireless sensor can be used to detect temperature.
 28. The cordlesstelephone system in claim 19 wherein the said wireless sensor operatesin a first frequency band different from a second frequency band that isused between the said cordless base and the said handset.
 29. Thecordless telephone system in claim 19 wherein the said wireless sensoroperates under at least one subpart of FCC rule section 47 CFR 15.231.30. The cordless telephone system in claim 19 wherein the said wirelesssensor operates in a first frequency range that is never used duringwireless communications between the said cordless base and the saidhandset.
 31. The cordless telephone system in claim 19 wherein the saidwireless sensor operates in a frequency band that is between 300 MHz and500 MHz.